{"id":7713,"date":"2026-10-01T15:00:00","date_gmt":"2026-10-01T15:00:00","guid":{"rendered":"https:\/\/bioprofile.com\/?page_id=7713"},"modified":"2026-10-01T15:41:30","modified_gmt":"2026-10-01T15:41:30","slug":"red-blood-cells","status":"publish","type":"page","link":"https:\/\/bioprofile.com\/en\/biomarkers\/red-blood-cells\/","title":{"rendered":"Red blood cells"},"content":{"rendered":"\n<div id=\"content\" tabindex=\"-1\"><\/div>\n<style>@import url('https:\/\/fonts.googleapis.com\/css2?family=Poppins:ital,wght@0,400;0,600;0,700;0,800;1,400&display=swap');\n\/* ===========================================================================\n   BioProfile advertorial, the design Jesse approved on 2026-07-30, expressed\n   as a WordPress design system.\n\n   THE @import IS LOAD BEARING and must stay the first thing in this sheet (a\n   CSS @import after any rule is dropped by the parser). elementor_canvas does\n   not enqueue the theme's fonts, so without it the whole page falls back to the\n   system font. Caught by LOOKING at the live page on 2026-07-30, right after\n   the template was switched to canvas.\n\n   Everything is scoped to `.bp-adv`, so nothing here can reach the rest of\n   bioprofile.com, and core blocks are styled BY ELEMENT so a heading, a\n   paragraph, a quote, a list, an image or a button inserted by hand inside the\n   advertorial comes out on-design with no class to remember.\n\n   Jesse's design feedback, 2026-07-29 23:38, point by point:\n   1. the light green and the dark green are the preferred colours; grey may be\n      used but the page must NOT open grey;\n   2. more colour and variation across sections, e.g. a colour block on the left\n      or the right side of a section, without overdesign;\n   3. ONE H1, plain text on white; everything else H2 or H3; an H2 may carry its\n      own background colour so the page can be read from the headings alone; an\n      H3 keeps its section background and gets a bigger font size;\n   4. reuse the results page design feel;\n   5. Written by \/ Verified by, the placeholder blocks and noindex stay.\n\n   COLOUR PROVENANCE. Not one hex is invented.\n   - #b7cb32  LIGHT GREEN, brand manual \"colours rejuvenation protocol\"\n              (R183 G203 B51). Same value as --bp-lime in\n              brands\/bioprofile\/brand\/tokens.md.\n   - #006b62  DARK GREEN, brand manual, nourish the cells (R0 G107 B98).\n   - #005859  brand manual primary teal, the value the brand is built on.\n   - #228a62  brand manual, challenge the body (R34 G138 B98).\n   - #7ca64c  brand manual, calm the mind (R124 G166 B76).\n   - #dbd4cd  brand manual \"additional color\", the warm neutral.\n   - #B7CB3329 is the brand token --bp-lime-soft (light green at 16 percent).\n   - the gradients are the brand token layer's own, copied verbatim.\n\n   SPECIFICITY NOTE. Elementor's global kit emits `.elementor-kit-6 h2` style\n   rules at (0,1,1). Element rules below are written `.bp-adv h2`, also (0,1,1),\n   and win on source order because this sheet is inline in the body while the\n   kit is a <link> in the head. Component rules that MUST NOT lose carry two\n   classes, e.g. `.bp-adv .wp-block-button__link`.\n\n   LAYOUT NOTE. Vertical rhythm uses `margin-block` and never the `margin`\n   shorthand, so the measure rule `.bp-adv-sec > * { margin-inline: auto }` can\n   centre a block without being outranked by its own element rule.\n   =========================================================================== *\/\n\n.bp-adv {\n  --bp-ink: #212527;\n  --bp-teal: #005859;\n  --bp-forest: #006B62;\n  --bp-emerald: #228A62;\n  --bp-olive: #7CA64C;\n  --bp-lime: #B7CB33;\n  --bp-lime-soft: #B7CB3329;\n  --bp-sand: #DBD4CB;\n  --bp-white: #FFFFFF;\n  --bp-foot: #6b6b6b;\n  --bp-grad-dark: linear-gradient(237deg, rgba(0,88,89,0.00) 62.94%, #005859 100%), linear-gradient(90deg, rgba(34,138,98,0.00) 40%, #228A62 100%), #006B62;\n  --bp-grad-lime: linear-gradient(110deg, rgba(183,203,51,0.00) 36.06%, rgba(183,203,51,0.25) 97.65%), #FFFFFF;\n  --bp-font: 'Poppins','Segoe UI',Arial,sans-serif;\n  --bp-fs-h1: 44px; --bp-fs-h2: 31px; --bp-fs-h3: 24px; --bp-fs-pre: 15px;\n  --bp-fs-body: 17px; --bp-fs-small: 14px; --bp-fs-foot: 13px; --bp-fs-btn: 17px;\n  --bp-lh-body: 1.75;\n  --bp-s-1: 4px; --bp-s-2: 8px; --bp-s-3: 12px; --bp-s-4: 16px;\n  --bp-s-5: 24px; --bp-s-6: 32px; --bp-s-7: 44px; --bp-s-8: 72px;\n  --bp-measure: 760px; --bp-side: 40px;\n  --bp-radius-photo: 16px; --bp-radius-btn: 10px; --bp-radius-card: 20px;\n  --bp-shadow: 0 10px 30px rgba(0,88,89,0.10);\n  font-family: var(--bp-font);\n  font-size: var(--bp-fs-body);\n  line-height: var(--bp-lh-body);\n  color: var(--bp-ink);\n  background: var(--bp-white);\n  -webkit-font-smoothing: antialiased;\n}\n.bp-adv, .bp-adv * { box-sizing: border-box; }\n.bp-adv p, .bp-adv li, .bp-adv h1, .bp-adv h2, .bp-adv h3, .bp-adv blockquote,\n.bp-adv a, .bp-adv cite, .bp-adv span { overflow-wrap: break-word; min-width: 0; }\n\n\/* THE TOGGLE. One word in the block's own \"Additional CSS class(es)\" field\n   hides an optional component on the front end without deleting anything. *\/\n.bp-adv .bp-off { display: none !important; }\n\n\/* the page opens on green, never on grey (his point 1) *\/\n.bp-adv .bp-adv-rule {\n  height: 6px; border: 0; margin-block: 0; max-width: none;\n  background: linear-gradient(90deg, #005859 0%, #006B62 38%, #228A62 66%, #B7CB33 100%);\n}\n\n\/* --- section surfaces ------------------------------------------------------ *\/\n.bp-adv-sec { position: relative; background: var(--bp-white);\n  padding: var(--bp-s-8) var(--bp-side); margin-block: 0; }\n\/* the measure: every direct child of a section is the 760px text column *\/\n.bp-adv-sec > * { max-width: var(--bp-measure); margin-inline: auto; }\n.bp-adv-sec > *:last-child { margin-block-end: 0; }\n.bp-adv-sec--wash  { background: linear-gradient(180deg, #B7CB331F 0%, #B7CB3312 100%), #FFFFFF; }\n.bp-adv-sec--dark  { background: var(--bp-grad-dark); color: var(--bp-white); }\n.bp-adv-sec--dark p, .bp-adv-sec--dark cite, .bp-adv-sec--dark li { color: var(--bp-white); }\n.bp-adv-sec--offer { background: var(--bp-grad-lime); text-align: center; }\n.bp-adv-sec--hero  { padding-block-start: var(--bp-s-6); }\n.bp-adv-sec--disclosure { padding-block: var(--bp-s-6);\n  border-top: 1px solid var(--bp-sand); }\n\n\/* --- the side accent bar, his own example (\"a colour block on the left or the\n       right side of a section\"), design rev 3: a slim vertical bar hugging the\n       text column rather than a wide margin panel. Below 1100px the margin is\n       gone, so it becomes a slim top edge. ---------------------------------- *\/\n.bp-adv-rail { overflow: hidden; }\n.bp-adv-rail::before {\n  content: \"\"; position: absolute; top: var(--bp-s-7); bottom: var(--bp-s-7);\n  width: 6px; border-radius: 3px;\n  background: linear-gradient(180deg, var(--bp-forest) 0%, var(--bp-lime) 100%);\n}\n.bp-adv-rail--left::before  { left: calc((100% - var(--bp-measure)) \/ 2 - 34px); }\n.bp-adv-rail--right::before { right: calc((100% - var(--bp-measure)) \/ 2 - 34px); }\n@media (max-width: 1099px) {\n  .bp-adv-rail::before { left: 0; right: 0; width: auto; bottom: auto; top: 0;\n    height: 4px; border-radius: 0; background: var(--bp-lime); }\n}\n\n\/* --- CORE BLOCKS, styled by element. This is the part that makes an inserted\n       block come out on-design with no class. --------------------------------- *\/\n.bp-adv p { font-size: var(--bp-fs-body); line-height: var(--bp-lh-body);\n  margin-block: 0 var(--bp-s-5); }\n.bp-adv h1 { font-size: var(--bp-fs-h1); font-weight: 700; line-height: 1.22;\n  margin-block: 0 var(--bp-s-4); }\n\/* an H2 is its own colour band, so the page can be read from the headings\n   alone (his point 3). Dark green on light sections, light green on the dark\n   one, so a heading always wins against its own background. *\/\n.bp-adv h2 {\n  font-size: var(--bp-fs-h2); font-weight: 700; line-height: 1.28;\n  margin-block: 0 var(--bp-s-5);\n  background: var(--bp-grad-dark); color: var(--bp-white);\n  padding: var(--bp-s-4) var(--bp-s-5);\n  border-radius: var(--bp-radius-btn);\n  border-left: 6px solid var(--bp-lime);\n}\n.bp-adv-sec--dark h2 { background: var(--bp-lime); color: var(--bp-ink);\n  border-left-color: var(--bp-forest); }\n\/* H3: same background as its section, bigger font (his point 3, verbatim) *\/\n.bp-adv h3 { font-size: var(--bp-fs-h3); font-weight: 700; line-height: 1.35;\n  color: var(--bp-forest); background: transparent; margin-block: 0 var(--bp-s-3); }\n.bp-adv-sec--dark h3 { color: var(--bp-lime); }\n.bp-adv ul, .bp-adv ol { font-size: var(--bp-fs-body); line-height: var(--bp-lh-body);\n  margin-block: 0 var(--bp-s-5); padding-left: var(--bp-s-5); }\n.bp-adv li { margin-block-end: var(--bp-s-2); }\n.bp-adv a { color: var(--bp-teal); text-decoration: underline; }\n.bp-adv a:hover { color: var(--bp-olive); }\n.bp-adv-sec--dark a, .bp-adv-sec--dark strong { color: var(--bp-lime); }\n.bp-adv strong { font-weight: 700; }\n\/* the highlight pill. Colours ride on the inline style core writes, so only\n   the shape lives here and any <mark> in the article picks it up. *\/\n.bp-adv mark {\n  padding: 0 10px; border-radius: 10px; display: inline;\n  -webkit-box-decoration-break: clone; box-decoration-break: clone;\n}\n\/* figures match the approved page exactly: card radius plus the soft shadow,\n   and a left-aligned caption rather than core's centred one *\/\n.bp-adv .wp-block-image { margin-block: var(--bp-s-5); margin-inline: auto; }\n.bp-adv .wp-block-image img { display: block; width: 100%; height: auto;\n  border-radius: var(--bp-radius-card); box-shadow: var(--bp-shadow); }\n.bp-adv .wp-block-image figcaption { font-size: var(--bp-fs-foot); line-height: 1.55;\n  color: var(--bp-foot); text-align: left; margin-block: var(--bp-s-2) 0; }\n.bp-adv .wp-block-embed, .bp-adv .wp-block-video { margin-block: var(--bp-s-5); }\n.bp-adv .wp-block-embed iframe, .bp-adv .wp-block-video video {\n  width: 100%; border-radius: var(--bp-radius-photo); }\n.bp-adv .wp-block-separator:not(.bp-adv-rule) { border: 0; border-top: 1px solid var(--bp-sand);\n  margin-block: var(--bp-s-5); }\n\n\/* quotes: core pullquote and core quote both land on the lime rule. The\n   font-size reset undoes core's own 1.5em on the figure, which would otherwise\n   leak into anything inside the quote that has no size of its own. *\/\n\/* margin-inline is load bearing, and it must be `auto` rather than `0`.\n   `blockquote` and `figure` carry a 40px side margin in the browser's own\n   default stylesheet, which indents the quote inside its rule and makes the\n   copy wrap early on a phone. But these blocks are direct children of a\n   section, so zeroing the side margin also defeats the measure rule\n   `.bp-adv-sec > * { margin-inline: auto }` and pins them to the left edge. *\/\n.bp-adv .wp-block-pullquote, .bp-adv .wp-block-quote {\n  border: 0; border-left: 5px solid var(--bp-lime); background: transparent;\n  padding: var(--bp-s-2) 0 var(--bp-s-2) var(--bp-s-5);\n  margin-block: var(--bp-s-5); margin-inline: auto;\n  text-align: left; font-size: var(--bp-fs-body);\n}\n.bp-adv .wp-block-pullquote blockquote { border: 0; margin: 0; padding: 0; }\n.bp-adv .wp-block-pullquote p, .bp-adv .wp-block-quote p {\n  font-size: 24px; line-height: 1.45; font-weight: 600;\n  margin-block: 0 var(--bp-s-2); color: var(--bp-forest); }\n.bp-adv .wp-block-pullquote cite, .bp-adv .wp-block-quote cite {\n  display: block; margin: 0; font-size: var(--bp-fs-small); color: var(--bp-foot);\n  font-style: normal; text-transform: none; }\n\n\/* buttons: two classes so core's own .wp-block-button__link cannot win *\/\n.bp-adv .wp-block-buttons { display: flex; justify-content: center;\n  margin-block: 0 var(--bp-s-4); }\n.bp-adv .wp-block-button__link {\n  display: inline-flex; align-items: center; justify-content: center; min-height: 48px;\n  background: var(--bp-teal); color: var(--bp-white); font-size: var(--bp-fs-btn);\n  font-weight: 700; line-height: 1.2; border-radius: var(--bp-radius-btn);\n  padding: 15px 44px; text-decoration: none; transition: background 250ms ease;\n  box-shadow: var(--bp-shadow);\n}\n.bp-adv .wp-block-button__link:hover { background: var(--bp-olive); color: var(--bp-white); }\n\n\/* --- slot 1: pre-headline, headline, sub-headline (Jesse's headline skill) --- *\/\n.bp-adv .bp-adv-preheadline {\n  color: var(--bp-forest); font-size: var(--bp-fs-pre); font-weight: 600; line-height: 1.5;\n  border-left: 4px solid var(--bp-lime); padding-left: var(--bp-s-3);\n  margin-block: 0 var(--bp-s-4);\n}\n.bp-adv .bp-adv-subheadline { font-size: 21px; line-height: 1.5; font-weight: 600;\n  color: var(--bp-forest); margin-block: 0 var(--bp-s-5); }\n.bp-adv .bp-adv-standfirst { font-size: 19px; line-height: 1.65;\n  margin-block: 0 var(--bp-s-5); }\n.bp-adv .bp-adv-lede { font-size: 18px; line-height: 1.7;\n  margin-block: 0 var(--bp-s-5); }\n.bp-adv .bp-adv-byline { font-size: var(--bp-fs-small); color: var(--bp-foot);\n  line-height: 1.6; margin-block: 0 var(--bp-s-5); }\n.bp-adv .bp-adv-socialproof { font-size: var(--bp-fs-small); color: var(--bp-foot);\n  margin-block: 0 var(--bp-s-5); }\n\/* the offer headline above the CTA. Jesse asked for a second H1 here; the brand\n   doc's accessibility rule is one h1 per page, so it is rendered at H1 size and\n   stays an h2 element. Named in the close as the one design conflict. *\/\n.bp-adv h2.bp-adv-offerhead {\n  font-size: var(--bp-fs-h1); font-weight: 700; line-height: 1.22;\n  margin-block: 0 var(--bp-s-4); text-align: center; color: var(--bp-ink);\n  background: none; padding: 0; border: 0; border-radius: 0;\n}\n\n\/* --- Written by + Verified by. The avatar is the first child and spans the\n       three text rows, so the whole box is four ordinary paragraphs and stays\n       editable without nested columns. ---------------------------------------- *\/\n.bp-adv .bp-adv-authors {\n  background: var(--bp-white); border: 1px solid var(--bp-sand);\n  border-top: 4px solid var(--bp-lime); border-radius: var(--bp-radius-card);\n  box-shadow: var(--bp-shadow); padding: var(--bp-s-5);\n  margin-block: 0 var(--bp-s-4);\n  \/* auto-fit, so switching the verified box off leaves one full-width author\n     rather than a half-empty card *\/\n  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));\n  gap: var(--bp-s-5); align-items: start;\n}\n.bp-adv .bp-adv-author {\n  display: grid; grid-template-columns: 62px 1fr; gap: 0 var(--bp-s-3);\n  align-items: start; min-width: 0;\n}\n.bp-adv .bp-adv-avatar {\n  grid-row: 1 \/ span 3; width: 62px; height: 62px; border-radius: 50%;\n  background: #B7CB331F; border: 2px dashed var(--bp-olive);\n  display: flex; align-items: center; justify-content: center;\n  font-size: 10px; font-weight: 700; letter-spacing: 0.06em; color: var(--bp-forest);\n  margin-block: 0;\n}\n.bp-adv .bp-adv-author.is-placeholder .bp-adv-avatar {\n  border-color: var(--bp-sand); background: #fff; color: var(--bp-foot); }\n.bp-adv .bp-adv-author-role {\n  font-size: 11px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;\n  color: var(--bp-forest); line-height: 1.6; margin-block: 0; }\n.bp-adv .bp-adv-author.is-placeholder .bp-adv-author-role { color: var(--bp-foot); }\n.bp-adv .bp-adv-author-name { font-size: 17px; font-weight: 700; line-height: 1.35;\n  margin-block: 0; }\n.bp-adv .bp-adv-author-cred { font-size: var(--bp-fs-foot); color: var(--bp-foot);\n  line-height: 1.55; margin-block: 0; }\n\/* the optional wrapper must not break the two-column grid of the box *\/\n.bp-adv .bp-adv-authors > .bp-optional { display: contents; }\n.bp-adv .bp-adv-authors > .bp-optional.bp-off { display: none !important; }\n\n\/* --- placeholders: image slot, video slot ---------------------------------- *\/\n.bp-adv .bp-slot {\n  display: flex; align-items: center; justify-content: center; text-align: center;\n  min-height: 180px; padding: var(--bp-s-4); margin-block: var(--bp-s-5) 0;\n  border: 2px dashed var(--bp-olive); border-radius: var(--bp-radius-photo);\n  background: #B7CB331F; color: var(--bp-forest);\n}\n.bp-adv .bp-slot p { font-size: var(--bp-fs-small); font-weight: 700; margin-block: 0; }\n.bp-adv .bp-slot--video { min-height: 260px; }\n\n\/* --- mid-article CTA band --------------------------------------------------- *\/\n.bp-adv .bp-adv-midcta {\n  background: var(--bp-grad-lime); border: 1px solid var(--bp-lime);\n  border-radius: var(--bp-radius-card); padding: var(--bp-s-5) var(--bp-s-4);\n  margin-block: var(--bp-s-6); text-align: center;\n}\n.bp-adv .bp-adv-midcta .wp-block-buttons { margin-block-end: var(--bp-s-2); }\n.bp-adv .bp-adv-midcta .bp-adv-foot { margin-block: 0; }\n\n\/* the closing CTA is one named unit in List View, so it moves and toggles as a\n   whole. It carries no box of its own: the spacing must read exactly as it does\n   on the approved page, where the three parts are plain siblings. *\/\n.bp-adv .bp-adv-ctablock { margin-block: 0 var(--bp-s-5); }\n.bp-adv .bp-adv-ctablock .wp-block-buttons { margin-block-end: var(--bp-s-4); }\n.bp-adv .bp-adv-ctablock .bp-adv-foot { margin-block: 0; }\n\n\/* --- the condition, slot 8: the results page reference-card shape ----------- *\/\n.bp-adv .bp-adv-condition {\n  background: var(--bp-white); border: 1px solid var(--bp-sand);\n  border-left: 5px solid var(--bp-lime); border-radius: var(--bp-radius-btn);\n  padding: var(--bp-s-4) var(--bp-s-5); font-weight: 600; box-shadow: var(--bp-shadow);\n}\n\n\/* --- the numbers card: the results page focus panel, same gradient, same\n       radius, same lime figures (\"use more of that design\") ------------------ *\/\n.bp-adv .bp-adv-numcard {\n  background: linear-gradient(135deg, var(--bp-teal) 0%, var(--bp-forest) 100%);\n  border-radius: var(--bp-radius-card);\n  padding: var(--bp-s-6) var(--bp-s-5) var(--bp-s-5);\n  box-shadow: var(--bp-shadow); margin-block: var(--bp-s-5) 0;\n  position: relative; overflow: hidden;\n}\n.bp-adv .bp-adv-numcard::after {\n  content: \"\"; position: absolute; right: -70px; top: -70px; width: 240px; height: 240px;\n  border-radius: 50%; background: rgba(255,255,255,0.05); pointer-events: none;\n}\n.bp-adv .bp-adv-numcard .wp-block-columns {\n  position: relative; z-index: 1; gap: var(--bp-s-5); margin-block: 0; }\n.bp-adv .bp-adv-numcard .wp-block-column { min-width: 0; }\n.bp-adv .bp-adv-num-v { font-size: 44px; font-weight: 700; line-height: 1.12;\n  color: var(--bp-lime); text-align: center; margin-block: 0 var(--bp-s-2); }\n.bp-adv .bp-adv-num-l { font-size: var(--bp-fs-small); line-height: 1.5;\n  color: rgba(255,255,255,0.92); text-align: center; margin-block: 0; }\n.bp-adv .bp-adv-numsrc { margin-block: var(--bp-s-5) 0; }\n\n\/* --- the proof slot: a dashed card until a consented quote exists. The quote\n       inside loses its own vertical margins, otherwise the card is one full\n       block of spacing taller than the approved page. --------------------- *\/\n.bp-adv .bp-adv-testimonial {\n  border: 1px dashed var(--bp-sand); border-left: 5px dashed var(--bp-sand);\n  background: var(--bp-white); border-radius: var(--bp-radius-card);\n  padding: var(--bp-s-5); margin-block: var(--bp-s-5);\n}\n\/* the card IS the quote frame, so the quote inside it carries no rule and no\n   indent of its own; otherwise the copy is indented twice and wraps early *\/\n.bp-adv .bp-adv-testimonial .wp-block-quote {\n  border: 0; padding: 0; margin-block: 0; }\n.bp-adv .bp-adv-testimonial .wp-block-quote p {\n  font-size: 17px; font-weight: 500; color: var(--bp-foot); }\n\n\/* --- steps, footnotes, disclosure ------------------------------------------- *\/\n.bp-adv .bp-adv-steps {\n  max-width: 520px; margin-block: 0 var(--bp-s-5); margin-inline: auto;\n  padding-left: 0; list-style: none; counter-reset: bpstep; text-align: left;\n}\n.bp-adv .bp-adv-steps li { position: relative; padding-left: 40px;\n  margin-block-end: var(--bp-s-3); counter-increment: bpstep; }\n.bp-adv .bp-adv-steps li::before {\n  content: counter(bpstep); position: absolute; left: 0; top: 4px;\n  width: 26px; height: 26px; border-radius: 50%;\n  background: var(--bp-forest); color: var(--bp-white);\n  font-size: var(--bp-fs-small); font-weight: 700;\n  display: flex; align-items: center; justify-content: center; line-height: 1;\n}\n.bp-adv .bp-adv-foot { font-size: var(--bp-fs-foot); color: var(--bp-foot); line-height: 1.6; }\n.bp-adv-sec--dark .bp-adv-foot { color: rgba(255,255,255,0.82); }\n\/* Jesse's mandatory CTA subtext, 2026-07-30 15:59: directly under the button,\n   one notch above the microline in weight so it reads as part of the ask *\/\n.bp-adv .bp-adv-ctasub {\n  margin-block: calc(var(--bp-s-4) * -0.5) var(--bp-s-2); margin-inline: auto;\n  max-width: 460px; font-size: 15px; line-height: 1.5; font-weight: 600;\n  color: var(--bp-teal); text-align: center;\n}\n.bp-adv .bp-adv-disclosure { font-size: var(--bp-fs-foot); color: var(--bp-foot);\n  line-height: 1.6; }\n.bp-adv .bp-adv-sources { margin-block-start: var(--bp-s-5); }\n.bp-adv .bp-adv-srclist { font-size: var(--bp-fs-foot); color: var(--bp-foot);\n  line-height: 1.6; padding-left: 20px; margin-block: 0; }\n.bp-adv .bp-adv-srclist li { margin-block-end: var(--bp-s-1); }\n.bp-adv .bp-h--center { text-align: center; }\n\n@media (max-width: 767px) {\n  .bp-adv {\n    --bp-fs-h1: 30px; --bp-fs-h2: 24px; --bp-fs-h3: 20px; --bp-fs-body: 16px;\n    --bp-fs-btn: 16px; --bp-fs-pre: 14px; --bp-side: 20px;\n    --bp-s-8: 44px; --bp-s-7: 32px;\n  }\n  .bp-adv .bp-adv-subheadline { font-size: 18px; }\n  .bp-adv .bp-adv-standfirst { font-size: 17px; }\n  .bp-adv .bp-adv-lede { font-size: 16px; }\n  .bp-adv .wp-block-pullquote p, .bp-adv .wp-block-quote p { font-size: 20px; }\n  .bp-adv h2 { padding: var(--bp-s-3) var(--bp-s-4); }\n  .bp-adv .bp-adv-num-v { font-size: 36px; }\n  .bp-adv .bp-adv-authors { grid-template-columns: 1fr; gap: var(--bp-s-5); }\n  \/* the button is full width on mobile. Core wraps the link in .wp-block-button,\n     which is shrink-to-fit, so widening only the link leaves it content-sized. *\/\n  .bp-adv .wp-block-button { width: 100%; }\n  .bp-adv .wp-block-button__link { padding: 15px 24px; width: 100%; }\n  .bp-adv .bp-adv-numcard .wp-block-columns { gap: var(--bp-s-4); }\n}\n@media (prefers-reduced-motion: reduce) { .bp-adv * { transition-duration: 0ms; } }\n\n\/* --- the author portrait -----------------------------------------------------\n   Two shapes, because there are two ways a portrait reaches the box.\n   1. `bp-adv-avatar--photo` turns the dashed FOTO circle into a photo frame when\n      an editor drops an inline image into the placeholder paragraph.\n   2. `bp-adv-avatar-img` is the shipped path: a REAL core\/image block, so the\n      picture is click-editable and \"Vervangen\" works. The grid-row span is the\n      load-bearing line. The paragraph avatar carries `grid-row: 1 \/ span 3` in\n      the 62px + 1fr card grid; a figure that does not carry it drops the name\n      under the photo instead of beside it. Found by screenshot on 2026-07-30\n      and fixed on the live page with exactly this rule. ---------------------- *\/\n.bp-adv-avatar--photo{border-style:solid;padding:0;overflow:hidden;background:#fff}\n.bp-adv-avatar--photo img{width:100%;height:100%;object-fit:cover;object-position:center;border-radius:50%;display:block}\n.bp-adv-author .bp-adv-avatar-img{grid-row:1 \/ span 3;flex:0 0 auto;margin:0;width:62px;height:62px}\n.bp-adv-author .bp-adv-avatar-img img{width:62px;height:62px;object-fit:cover;object-position:center;border-radius:50%;border:2px solid var(--bp-olive);display:block}\n\n\/* --- the advertorial's own chrome (synced patterns 4822 and 4823) ------------\n   Deliberately NOT scoped to `.bp-adv`: the header and footer are siblings of\n   the article, outside that container, because canvas gives the page no chrome\n   of its own. A <style> element styles the whole document wherever it sits, so\n   these rules reach the two pattern references either side of the article. --- *\/\n.bp-adv-sitehead{background:#fff;border-bottom:1px solid #e6ece9;padding:12px 24px;margin:0}\n.bp-adv-sitehead .bp-adv-sitehead-logo{margin:0 auto;max-width:1120px}\n.bp-adv-sitehead img{height:30px;width:auto;display:block}\n.bp-adv-sitefoot{background:#f4f1ec;border-top:1px solid #e6ece9;padding:28px 24px;margin-top:44px}\n.bp-adv-sitefoot p{max-width:1120px;margin:0 auto;font-size:13px;line-height:1.8;color:#4d5f5d;text-align:center}\n.bp-adv-sitefoot a{color:#005859;text-decoration:underline}\n.bp-adv-sitefoot .bp-adv-sitefoot-legal{margin-top:6px}\n.bp-biomarker sup{font-size:.72em;line-height:0;vertical-align:super;color:var(--bp-foot);margin-left:1px}\n.bp-biomarker .bp-bm-crumbs{font-size:var(--bp-fs-small);color:var(--bp-foot);margin-block:0 var(--bp-s-3)}\n.bp-biomarker .bp-bm-crumbs a,.bp-biomarker .bp-bm-toc a,.bp-biomarker .bp-bm-src a,.bp-biomarker .bp-bm-rows a,\n.bp-biomarker .bp-bm-related a{display:inline-flex;align-items:center;min-height:44px}\n.bp-biomarker .bp-bm-names{font-size:var(--bp-fs-small);color:var(--bp-foot);margin-block:0 var(--bp-s-4)}\n.bp-biomarker .bp-bm-toc ul{margin-block:0;padding-left:var(--bp-s-5)}\n.bp-biomarker .bp-bm-toc li{margin:0 0 var(--bp-s-1)}\n.bp-biomarker .bp-bm-src li{overflow-wrap:anywhere}\n.bp-biomarker .bp-bm-rows{list-style:none;padding-left:0}\n.bp-biomarker .bp-bm-rows li{padding-block:6px;border-bottom:1px solid var(--bp-sand)}\n.bp-biomarker .bp-bm-rows li:last-child{border-bottom:0}\n.bp-biomarker .bp-bm-rows a{font-weight:700}\n.bp-biomarker .bp-bm-count{font-size:var(--bp-fs-small);color:var(--bp-foot);margin-block:0 var(--bp-s-3)}\n.bp-biomarker figure.wp-block-table{margin-block:var(--bp-s-4) var(--bp-s-2);margin-inline:auto;overflow:visible}\n.bp-biomarker figure.wp-block-table table{table-layout:fixed;width:100%;border-collapse:collapse;\n font-size:var(--bp-fs-small);line-height:1.45;background:var(--bp-white)}\n.bp-biomarker figure.wp-block-table th,.bp-biomarker figure.wp-block-table td{border:1px solid var(--bp-sand);\n padding:8px 10px;vertical-align:top;text-align:left;hyphens:auto;-webkit-hyphens:auto;overflow-wrap:break-word}\n.bp-biomarker figure.wp-block-table thead th{background:var(--bp-teal);color:var(--bp-white);font-weight:600}\n.bp-biomarker .bp-bm-caption{font-size:var(--bp-fs-foot);color:var(--bp-foot);margin-block:0 var(--bp-s-5)}\n@media (max-width:480px){.bp-biomarker figure.wp-block-table th,.bp-biomarker figure.wp-block-table td{\n padding:6px 6px;font-size:13.5px}}<\/style>\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/bioprofile.com\/biomarkers\/erytrocyten\/#article\",\"headline\":\"Erytrocyten (rode bloedcellen)\",\"description\":\"Wat zijn erytrocyten? Het lab noemt 4,5 tot 5,5 10^12\/l normaal. Lees waar een lage of hoge waarde op kan wijzen en wat je erytrocyten beinvloedt.\",\"inLanguage\":\"nl-NL\",\"dateModified\":\"2026-09-30\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/bioprofile.com\/biomarkers\/erytrocyten\/\"},\"isPartOf\":{\"@id\":\"https:\/\/bioprofile.com\/biomarkers\/erytrocyten\/\"},\"publisher\":{\"@id\":\"https:\/\/bioprofile.com\/#organization\"},\"about\":{\"@id\":\"https:\/\/bioprofile.com\/biomarkers\/erytrocyten\/#biomarker\"},\"citation\":[{\"@type\":\"CreativeWork\",\"name\":\"MedlinePlus, U.S. National Library of Medicine. Red Blood Cell (RBC) Count. Geraadpleegd op 30 september 2026.\",\"url\":\"https:\/\/medlineplus.gov\/lab-tests\/red-blood-cell-rbc-count\/\"},{\"@type\":\"CreativeWork\",\"name\":\"Labplusarts, het laboratorium waarmee BioProfile werkt: referentiewaarde bij de bepaling erytrocyten (KBB), 4,5 tot 5,5 10^12\/l. Lijst van 24 september 2026.\"},{\"@type\":\"CreativeWork\",\"name\":\"BioProfile, de pakketten van het bloedonderzoek en de waarden in elk pakket.\",\"url\":\"https:\/\/bioprofile.com\/bloedonderzoek\/\"}]},{\"@type\":\"MedicalTest\",\"@id\":\"https:\/\/bioprofile.com\/biomarkers\/erytrocyten\/#biomarker\",\"name\":\"Erytrocyten\",\"alternateName\":[\"Red blood cells\"]}]}<\/script>\n\n\n\n<section class=\"wp-block-group bp-adv bp-biomarker bp-biomarker--page is-layout-flow wp-block-group-is-layout-flow\">\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity bp-adv-rule\"\/>\n\n\n\n<div class=\"wp-block-group bp-adv-sec bp-adv-sec--hero is-layout-flow wp-block-group-is-layout-flow\">\n\n<p class=\"bp-bm-crumbs wp-block-paragraph\"><a href=\"https:\/\/bioprofile.com\/en\/\">Home<\/a> \u203a <a href=\"https:\/\/bioprofile.com\/en\/biomarkers\/\">Biomarkers<\/a> \u203a <span>Red blood cells<\/span><\/p>\n\n\n\n<h1 class=\"wp-block-heading bp-adv-h1\">Red blood cells (erythrocytes)<\/h1>\n\n\n\n<p class=\"bp-adv-standfirst wp-block-paragraph\">Red blood cells are the red cells in your blood. They are made in your bone marrow and contain hemoglobin, an iron-rich protein that carries oxygen from your lungs to every cell in your body. A result that is higher or lower than normal is often the first sign of illness: a low value can point to anaemia, a high value to dehydration.<sup>[1]<\/sup><\/p>\n\n\n\n<p class=\"bp-adv-lede wp-block-paragraph\">On this page, you can read what erythrocytes are, what the guidelines say about a value that is too low or too high, what affects your value and which other values are best read alongside it.<\/p>\n\n\n\n<p class=\"bp-bm-names wp-block-paragraph\">Also known as: red blood cells, erythrocyte count, RBC. At the lab: KBB.<\/p>\n\n\n\n<p class=\"bp-adv-byline wp-block-paragraph\">Updated 30 September 2026<\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-adv-sec bp-adv-sec--wash is-layout-flow wp-block-group-is-layout-flow\">\n\n<div class=\"wp-block-group bp-bm-toc is-layout-flow wp-block-group-is-layout-flow\">\n\n<h2 class=\"wp-block-heading\" id=\"bp-inhoud\">On this page<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li><a href=\"#bp-in-het-kort\">In short<\/a><\/li>\n\n\n<li><a href=\"#bp-wat-is-erytrocyten\">What are red blood cells?<\/a><\/li>\n\n\n<li><a href=\"#bp-waarom-het-ertoe-doet\">Why this value matters<\/a><\/li>\n\n\n<li><a href=\"#bp-wat-je-waarde-zegt\">What your red blood cell value tells you<\/a><\/li>\n\n\n<li><a href=\"#bp-wat-het-beinvloedt\">What affects your red blood cells<\/a><\/li>\n\n\n<li><a href=\"#bp-welke-pakketten\">Which BioProfile packages measure red blood cells<\/a><\/li>\n\n\n<li><a href=\"#bp-waarden-die-erbij-horen\">Related values<\/a><\/li>\n\n\n<li><a href=\"#bp-hoe-gemaakt\">How this page was made<\/a><\/li>\n\n\n<li><a href=\"#bp-bronnen\">Sources<\/a><\/li>\n\n<\/ul>\n\n<\/div>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-adv-sec is-layout-flow wp-block-group-is-layout-flow\">\n\n<h2 class=\"wp-block-heading\" id=\"bp-in-het-kort\">In short<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>A red blood cell count measures the number of red blood cells in your blood and is almost always part of the full blood count.<sup>[1]<\/sup><\/li>\n\n\n<li>Red blood cells carry oxygen from your lungs to every cell in your body, so those cells can grow and make energy.<sup>[1]<\/sup><\/li>\n\n\n<li>A low result can point to anaemia, too few nutrients or blood loss from a wound.<sup>[1]<\/sup><\/li>\n\n\n<li>A high result can point to dehydration, a lung disease or living at high altitude.<sup>[1]<\/sup><\/li>\n\n<\/ul>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-adv-sec bp-adv-sec--wash is-layout-flow wp-block-group-is-layout-flow\">\n\n<h2 class=\"wp-block-heading\" id=\"bp-wat-is-erytrocyten\">What are erythrocytes?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A red blood cell count measures the number of red blood cells in your blood. Red blood cells are made in your bone marrow, the spongy tissue inside your large bones.<sup>[1]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Those cells contain hemoglobin, an iron-rich protein that carries oxygen from your lungs to every cell in your body. Your cells need oxygen to grow, divide and make the energy that keeps you functioning.<sup>[1]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The test is also called a red blood cell count or RBC. It is almost always part of the full blood count, a group of tests that measures the number and type of cells in your blood. The result helps detect problems with your red blood cells, such as anaemia, where your body does not make enough healthy red blood cells.<sup>[1]<\/sup><\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-adv-sec is-layout-flow wp-block-group-is-layout-flow\">\n\n<h2 class=\"wp-block-heading\" id=\"bp-waarom-het-ertoe-doet\">Why this value matters<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A red blood cell count that is higher or lower than normal is often the first sign of illness. That is why this value appears on a result so often.<sup>[1]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You often get the test as part of a full blood count during a routine check-up. A doctor may also ask for it if you are receiving care that can affect your blood cells, to follow how things are going with a long-term kidney condition, or if you have symptoms that fit a low or high value.<sup>[1]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">With a low value, you may be short of breath, feel weak or tired, have headaches or dizziness, notice a problem with the pace or rhythm of your heartbeat, or have pale skin. With a high value, you may have headaches, dizziness or problems with your vision.<sup>[1]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If your result is low or high, more tests may follow to complete the picture: a reticulocyte count, which counts the still young red blood cells and shows whether your bone marrow is making enough of them, iron tests, or a test for vitamin B.<sup>[1]<\/sup><\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-adv-sec bp-adv-sec--wash is-layout-flow wp-block-group-is-layout-flow\">\n\n<h2 class=\"wp-block-heading\" id=\"bp-wat-je-waarde-zegt\">What your erythrocyte value tells you<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">The lab's reference range<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Labplusarts, the laboratory BioProfile works with, uses a reference value of 4.5 to 5.5 10^12\/l for red blood cells (KBB). The lab calls a value between those limits normal.<sup>[2]<\/sup><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What MedlinePlus says about a low and a high result<\/h3>\n\n\n\n<figure class=\"wp-block-table bp-bm-table\"><table><thead><tr><th>Result<\/th><th>What it can point to<\/th><th>Who it is for<\/th><\/tr><\/thead><tbody><tr><td>Lower than normal<sup>[1]<\/sup><\/td><td>Anaemia, too few calories, vitamins or minerals, a condition of the blood or bone marrow, a kidney condition, blood loss from a wound, a condition caused by alcohol use, or being pregnant<\/td><td>People whose count comes out lower than normal<\/td><\/tr><tr><td>Normal<sup>[1]<\/sup><\/td><td>The count is neither too low nor too high<\/td><td>People whose count is normal<\/td><\/tr><tr><td>Higher than normal<sup>[1]<\/sup><\/td><td>Dehydration, a heart condition, a lung disease, scarring in the lungs often from smoking, a kidney condition, a condition in which you keep stopping breathing in your sleep, or a disease in which your bone marrow makes too many red blood cells<\/td><td>People whose count comes out higher than normal<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"bp-bm-caption wp-block-paragraph\">MedlinePlus, U.S. National Library of Medicine, Red Blood Cell (RBC) Count: this source's own grouping into a low, a normal and a high count, for people who have this blood test.<sup>[1]<\/sup><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Red blood cells too low<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A low count can point to anaemia, where your body does not make enough healthy red blood cells. Too few calories, vitamins or minerals, a condition of the blood or bone marrow, a kidney condition, blood loss from a wound, a condition caused by alcohol use and being pregnant can also lower the count. Symptoms that can come with it are shortness of breath, weakness or tiredness, headaches, dizziness, a problem with the pace or rhythm of your heartbeat and pale skin.<sup>[1]<\/sup><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Red blood cells too high<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A high count can point to dehydration, a heart condition, a lung disease, scarring in the lungs that is often caused by smoking, a kidney condition, a condition where you repeatedly stop breathing in your sleep, or a disease where your bone marrow makes too many red blood cells. Symptoms that can come with it are headaches, dizziness and problems with your vision. Talk to your doctor about your result: they will also look at your symptoms, your medical history and your other blood values.<sup>[1]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">BioProfile is working on its own zones for each value, from risk to optimal. A doctor reviews those zones before they appear in your result.<\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-adv-sec is-layout-flow wp-block-group-is-layout-flow\">\n\n<h2 class=\"wp-block-heading\" id=\"bp-wat-het-beinvloedt\">What affects your erythrocytes<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Fluid in your body<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Dehydration is one of the things that can cause a high count. Your blood then contains less fluid, and that affects the result.<sup>[1]<\/sup><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Living at high altitude<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Living at high altitude can lead to a high number of red blood cells. If you live at high altitude, tell your doctor when your result is being read.<sup>[1]<\/sup><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Smoking<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Scarring in the lungs is often caused by smoking cigarettes, and this kind of scarring can lead to a high number of red blood cells.<sup>[1]<\/sup><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Substances and alcohol<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Misusing certain substances to boost sports performance can push the count up. A condition caused by alcohol use can instead bring the count down, as can being pregnant.<sup>[1]<\/sup><\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-adv-sec bp-adv-sec--wash is-layout-flow wp-block-group-is-layout-flow\">\n\n<h2 class=\"wp-block-heading\" id=\"bp-welke-pakketten\">Which BioProfile packages measure erythrocytes<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Red blood cells are included in all five packages, from BioProfile 31 to BioProfile 150.<sup>[3]<\/sup><\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-3e41869c wp-block-buttons-is-layout-flex\">\n\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/bioprofile.com\/en\/blood-testing\/\">View the packages<\/a><\/div>\n\n<\/div>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-adv-sec is-layout-flow wp-block-group-is-layout-flow\">\n\n<h2 class=\"wp-block-heading\" id=\"bp-waarden-die-erbij-horen\">Values that go with it<\/h2>\n\n\n\n<ul class=\"wp-block-list bp-bm-related\">\n\n<li><a href=\"https:\/\/bioprofile.com\/en\/biomarkers\/hemoglobin\/\">Hemoglobin<\/a>: red blood cells contain hemoglobin, the iron-rich protein that carries oxygen from your lungs to every cell in your body, so this value tells you how well that transport is set up.<sup>[1]<\/sup><\/li>\n\n\n<li><a href=\"https:\/\/bioprofile.com\/en\/biomarkers\/white-blood-cells\/\">White blood cells<\/a>: your red blood cell count is almost always part of the full blood count, a group of tests that measures the number and type of cells in your blood, and white blood cells are another type of cell in that picture.<sup>[1]<\/sup><\/li>\n\n\n<li><strong>Platelets<\/strong>: also a type of cell in your blood, and the full blood count that your red blood cells belong to measures exactly that: the number and type of cells in your blood.<sup>[1]<\/sup><\/li>\n\n\n<li><strong>Hematocrit<\/strong>: part of the picture of your red blood cells, the cells made in your bone marrow that carry oxygen around your body, and it puts your red blood cell count in a wider context.<sup>[1]<\/sup><\/li>\n\n\n<li><strong>Lymphocytes<\/strong>: a type of white cell in your blood. Besides the number of cells, the full blood count also measures the type of cells in your blood.<sup>[1]<\/sup><\/li>\n\n<\/ul>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-adv-sec bp-adv-sec--wash is-layout-flow wp-block-group-is-layout-flow\">\n\n<h2 class=\"wp-block-heading\" id=\"bp-hoe-gemaakt\">How this page was made<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The BioProfile editorial team wrote this page on 30 September 2026 from the sources below, which we read on 30 September 2026. Every number on this page appears in one of those sources, with the number of that source next to it. An expert still has to review this page; after that review, the name of that expert and the date of the review appear at the top. This page gives an explanation, not a diagnosis. Discuss an abnormal value with your GP.<\/p>\n\n<\/div>\n\n\n\n<div class=\"wp-block-group bp-adv-sec bp-adv-sec--disclosure is-layout-flow wp-block-group-is-layout-flow\">\n\n<h2 class=\"wp-block-heading\" id=\"bp-bronnen\">Sources<\/h2>\n\n\n\n<ol class=\"wp-block-list bp-adv-srclist bp-bm-src\">\n\n<li>MedlinePlus, U.S. National Library of Medicine. Red Blood Cell (RBC) Count. Accessed on 30 September 2026. <a href=\"https:\/\/medlineplus.gov\/lab-tests\/red-blood-cell-rbc-count\/\" target=\"_blank\" rel=\"noopener\">https:\/\/medlineplus.gov\/lab-tests\/red-blood-cell-rbc-count\/<\/a><\/li>\n\n\n<li>Labplusarts, the laboratory BioProfile works with: reference value for the red blood cells (KBB) test, 4.5 to 5.5 10^12\/l. List dated 24 September 2026.<\/li>\n\n\n<li>BioProfile, the blood test packages and the values in each package. <a href=\"https:\/\/bioprofile.com\/en\/blood-testing\/\" target=\"_blank\" rel=\"noopener\">https:\/\/bioprofile.com\/en\/blood-testing\/<\/a><\/li>\n\n<\/ol>\n\n<\/div>\n\n<\/section>\n\n","protected":false},"excerpt":{"rendered":"<p>Home \u203a Biomarkers \u203a Red blood cells Red blood cells (erythrocytes) Red blood cells are the red cells in your blood. They are made in your bone marrow and contain hemoglobin, an iron-rich protein that carries oxygen from your lungs to every cell in your body. A result that is higher or lower than normal [&hellip;]<\/p>\n","protected":false},"author":18,"featured_media":0,"parent":6592,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"elementor_header_footer","meta":{"_yoast_wpseo_title":"Red blood cells: what your value tells you | BioProfile","_yoast_wpseo_metadesc":"What are red blood cells? The lab calls 4.5 to 5.5 10^12\/l normal. Read what a low or high value can point to and what affects your red blood cells.","_yoast_wpseo_meta-robots-noindex":"2","_yoast_wpseo_opengraph-image":"","_yoast_wpseo_opengraph-image-id":"","_yoast_wpseo_twitter-image":"","_yoast_wpseo_twitter-image-id":"","inline_featured_image":false,"footnotes":""},"class_list":["post-7713","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Red blood cells: what your value tells you | BioProfile<\/title>\n<meta name=\"description\" content=\"What are red blood cells? The lab calls 4.5 to 5.5 10^12\/l normal. Read what a low or high value can point to and what affects your red blood cells.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/bioprofile.com\/en\/biomarkers\/red-blood-cells\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Red blood cells: what your value tells you | BioProfile\" \/>\n<meta property=\"og:description\" content=\"What are red blood cells? The lab calls 4.5 to 5.5 10^12\/l normal. Read what a low or high value can point to and what affects your red blood cells.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/bioprofile.com\/en\/biomarkers\/red-blood-cells\/\" \/>\n<meta property=\"og:site_name\" content=\"Bioprofile.com\" \/>\n<meta property=\"article:modified_time\" content=\"2026-10-01T15:41:30+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"7 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/bioprofile.com\\\/en\\\/biomarkers\\\/red-blood-cells\\\/\",\"url\":\"https:\\\/\\\/bioprofile.com\\\/en\\\/biomarkers\\\/red-blood-cells\\\/\",\"name\":\"Red blood cells: what your value tells you | BioProfile\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/bioprofile.com\\\/en\\\/#website\"},\"datePublished\":\"2026-10-01T15:00:00+00:00\",\"dateModified\":\"2026-10-01T15:41:30+00:00\",\"description\":\"What are red blood cells? The lab calls 4.5 to 5.5 10^12\\\/l normal. Read what a low or high value can point to and what affects your red blood cells.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/bioprofile.com\\\/en\\\/biomarkers\\\/red-blood-cells\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/bioprofile.com\\\/en\\\/biomarkers\\\/red-blood-cells\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/bioprofile.com\\\/en\\\/biomarkers\\\/red-blood-cells\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/bioprofile.com\\\/en\\\/home-2026\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Biomarkers\",\"item\":\"https:\\\/\\\/bioprofile.com\\\/en\\\/biomarkers\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Red blood cells\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/bioprofile.com\\\/en\\\/#website\",\"url\":\"https:\\\/\\\/bioprofile.com\\\/en\\\/\",\"name\":\"Bioprofile.com\",\"description\":\"Live longer, stay younger\",\"publisher\":{\"@id\":\"https:\\\/\\\/bioprofile.com\\\/en\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/bioprofile.com\\\/en\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/bioprofile.com\\\/en\\\/#organization\",\"name\":\"Bioprofile.com\",\"url\":\"https:\\\/\\\/bioprofile.com\\\/en\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/bioprofile.com\\\/en\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/bioprofile.com\\\/wp-content\\\/uploads\\\/2024\\\/08\\\/logo.svg\",\"contentUrl\":\"https:\\\/\\\/bioprofile.com\\\/wp-content\\\/uploads\\\/2024\\\/08\\\/logo.svg\",\"width\":173,\"height\":48,\"caption\":\"Bioprofile.com\"},\"image\":{\"@id\":\"https:\\\/\\\/bioprofile.com\\\/en\\\/#\\\/schema\\\/logo\\\/image\\\/\"}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Red blood cells: what your value tells you | BioProfile","description":"What are red blood cells? The lab calls 4.5 to 5.5 10^12\/l normal. Read what a low or high value can point to and what affects your red blood cells.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/bioprofile.com\/en\/biomarkers\/red-blood-cells\/","og_locale":"en_US","og_type":"article","og_title":"Red blood cells: what your value tells you | BioProfile","og_description":"What are red blood cells? The lab calls 4.5 to 5.5 10^12\/l normal. Read what a low or high value can point to and what affects your red blood cells.","og_url":"https:\/\/bioprofile.com\/en\/biomarkers\/red-blood-cells\/","og_site_name":"Bioprofile.com","article_modified_time":"2026-10-01T15:41:30+00:00","twitter_card":"summary_large_image","twitter_misc":{"Est. reading time":"7 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/bioprofile.com\/en\/biomarkers\/red-blood-cells\/","url":"https:\/\/bioprofile.com\/en\/biomarkers\/red-blood-cells\/","name":"Red blood cells: what your value tells you | BioProfile","isPartOf":{"@id":"https:\/\/bioprofile.com\/en\/#website"},"datePublished":"2026-10-01T15:00:00+00:00","dateModified":"2026-10-01T15:41:30+00:00","description":"What are red blood cells? The lab calls 4.5 to 5.5 10^12\/l normal. Read what a low or high value can point to and what affects your red blood cells.","breadcrumb":{"@id":"https:\/\/bioprofile.com\/en\/biomarkers\/red-blood-cells\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/bioprofile.com\/en\/biomarkers\/red-blood-cells\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/bioprofile.com\/en\/biomarkers\/red-blood-cells\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/bioprofile.com\/en\/home-2026\/"},{"@type":"ListItem","position":2,"name":"Biomarkers","item":"https:\/\/bioprofile.com\/en\/biomarkers\/"},{"@type":"ListItem","position":3,"name":"Red blood cells"}]},{"@type":"WebSite","@id":"https:\/\/bioprofile.com\/en\/#website","url":"https:\/\/bioprofile.com\/en\/","name":"Bioprofile.com","description":"Live longer, stay younger","publisher":{"@id":"https:\/\/bioprofile.com\/en\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/bioprofile.com\/en\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/bioprofile.com\/en\/#organization","name":"Bioprofile.com","url":"https:\/\/bioprofile.com\/en\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/bioprofile.com\/en\/#\/schema\/logo\/image\/","url":"https:\/\/bioprofile.com\/wp-content\/uploads\/2024\/08\/logo.svg","contentUrl":"https:\/\/bioprofile.com\/wp-content\/uploads\/2024\/08\/logo.svg","width":173,"height":48,"caption":"Bioprofile.com"},"image":{"@id":"https:\/\/bioprofile.com\/en\/#\/schema\/logo\/image\/"}}]}},"_links":{"self":[{"href":"https:\/\/bioprofile.com\/en\/wp-json\/wp\/v2\/pages\/7713","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bioprofile.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/bioprofile.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/bioprofile.com\/en\/wp-json\/wp\/v2\/users\/18"}],"replies":[{"embeddable":true,"href":"https:\/\/bioprofile.com\/en\/wp-json\/wp\/v2\/comments?post=7713"}],"version-history":[{"count":1,"href":"https:\/\/bioprofile.com\/en\/wp-json\/wp\/v2\/pages\/7713\/revisions"}],"predecessor-version":[{"id":7714,"href":"https:\/\/bioprofile.com\/en\/wp-json\/wp\/v2\/pages\/7713\/revisions\/7714"}],"up":[{"embeddable":true,"href":"https:\/\/bioprofile.com\/en\/wp-json\/wp\/v2\/pages\/6592"}],"wp:attachment":[{"href":"https:\/\/bioprofile.com\/en\/wp-json\/wp\/v2\/media?parent=7713"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}