{"id":15413,"date":"2026-10-20T15:00:00","date_gmt":"2026-10-20T15:00:00","guid":{"rendered":"https:\/\/bioprofile.com\/?page_id=15413"},"modified":"2026-11-06T20:37:45","modified_gmt":"2026-11-06T20:37:45","slug":"t4-libre","status":"publish","type":"page","link":"https:\/\/bioprofile.com\/es\/biomarkers\/t4-libre\/","title":{"rendered":"T4 libre"},"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. 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Helder uitgelegd, met bronnen.\",\"inLanguage\":\"nl-NL\",\"dateModified\":\"2026-10-10\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/bioprofile.com\/biomarkers\/vrij-t4\/\"},\"isPartOf\":{\"@id\":\"https:\/\/bioprofile.com\/biomarkers\/vrij-t4\/\"},\"publisher\":{\"@id\":\"https:\/\/bioprofile.com\/#organization\"},\"about\":{\"@id\":\"https:\/\/bioprofile.com\/biomarkers\/vrij-t4\/#biomarker\"},\"citation\":[{\"@type\":\"CreativeWork\",\"name\":\"MedlinePlus, U.S. National Library of Medicine. Thyroxine (T4) Test. Geraadpleegd op 10 oktober 2026.\",\"url\":\"https:\/\/medlineplus.gov\/lab-tests\/thyroxine-t4-test\/\"},{\"@type\":\"CreativeWork\",\"name\":\"Labplusarts, het laboratorium waarmee BioProfile werkt: referentiewaarde bij de bepaling vrij t4 (FT4), 11,0 tot 21,0 pmol\/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\/vrij-t4\/#biomarker\",\"name\":\"Vrij T4\",\"alternateName\":[\"Free T4\"]}]}<\/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\/es\/\">Inicio<\/a> \u203a <a href=\"https:\/\/bioprofile.com\/es\/biomarkers\/\">Biomarcadores<\/a> \u203a <span>T4 libre<\/span><\/p>\n\n\n\n<h1 class=\"wp-block-heading bp-adv-h1\">T4 libre (FT4): qu\u00e9 dice tu valor sobre tu tiroides<\/h1>\n\n\n\n<p class=\"bp-adv-standfirst wp-block-paragraph\">La T4 libre es la forma activa de la hormona tiroxina en tu sangre. Un valor demasiado bajo o demasiado alto puede indicar un problema en tu tiroides.<sup>[1]<\/sup><\/p>\n\n\n\n<p class=\"bp-adv-lede wp-block-paragraph\">En esta p\u00e1gina descubrir\u00e1s qu\u00e9 es la T4 libre, qu\u00e9 dicen las gu\u00edas sobre un valor demasiado bajo o demasiado alto, qu\u00e9 influye en tu valor y qu\u00e9 valores conviene mirar junto a ella.<\/p>\n\n\n\n<p class=\"bp-bm-names wp-block-paragraph\">Tambi\u00e9n llamada: tiroxina libre, free T4, tiroxina. En el laboratorio: FT4.<\/p>\n\n\n\n<p class=\"bp-adv-byline wp-block-paragraph\">Actualizado el 10 de octubre de 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\">En esta p\u00e1gina<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li><a href=\"#bp-in-het-kort\">En resumen<\/a><\/li>\n\n\n<li><a href=\"#bp-wat-is-vrij-t4\">\u00bfQu\u00e9 es la T4 libre?<\/a><\/li>\n\n\n<li><a href=\"#bp-waarom-het-ertoe-doet\">Por qu\u00e9 importa tu hormona tiroidea<\/a><\/li>\n\n\n<li><a href=\"#bp-wat-je-waarde-zegt\">Qu\u00e9 dice tu valor de T4 libre<\/a><\/li>\n\n\n<li><a href=\"#bp-wat-het-beinvloedt\">Qu\u00e9 influye en tu T4 libre<\/a><\/li>\n\n\n<li><a href=\"#bp-welke-pakketten\">Qu\u00e9 paquetes de BioProfile miden la T4 libre<\/a><\/li>\n\n\n<li><a href=\"#bp-waarden-die-erbij-horen\">Valores relacionados<\/a><\/li>\n\n\n<li><a href=\"#bp-hoe-gemaakt\">C\u00f3mo se ha hecho esta p\u00e1gina<\/a><\/li>\n\n\n<li><a href=\"#bp-bronnen\">Fuentes<\/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\">En resumen<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>La T4 es la hormona m\u00e1s importante que produce tu tiroides.<sup>[1]<\/sup><\/li>\n\n\n<li>La T4 libre es la forma que entra en tus tejidos, all\u00ed donde la necesitas.<sup>[1]<\/sup><\/li>\n\n\n<li>Tener demasiada o muy poca T4 puede indicar un problema de tiroides.<sup>[1]<\/sup><\/li>\n\n\n<li>Una prueba de T4 por s\u00ed sola no dice lo suficiente, as\u00ed que normalmente tambi\u00e9n se mide la TSH.<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-vrij-t4\">\u00bfQu\u00e9 es la T4 libre?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Tu tiroides es una peque\u00f1a gl\u00e1ndula con forma de mariposa situada en la parte delantera del cuello. La hormona m\u00e1s importante que produce se llama tiroxina, o T4.<sup>[1]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La T4 est\u00e1 en tu sangre en dos formas. La T4 libre es la forma activa que entra en tus tejidos. La T4 unida va ligada a prote\u00ednas y permanece en tu sangre como reserva hasta que tus tejidos la necesitan.<sup>[1]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Una prueba de T4 libre mide solo la parte libre. Los expertos m\u00e9dicos consideran esta prueba m\u00e1s precisa que una de T4 total, y por eso se usa m\u00e1s a menudo.<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\">Por qu\u00e9 importa tu hormona tiroidea<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Las hormonas tiroideas regulan c\u00f3mo usa tu cuerpo la energ\u00eda. Act\u00faan en casi todos los \u00f3rganos. Influyen en tu respiraci\u00f3n, tu ritmo card\u00edaco, tu peso, tu digesti\u00f3n y tu estado de \u00e1nimo. En los ni\u00f1os tambi\u00e9n influyen en el crecimiento.<sup>[1]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La falta de hormona tiroidea ralentiza tu cuerpo. Por ejemplo, puedes sentir cansancio, tu peso puede aumentar, puedes tener fr\u00edo con facilidad y tu piel puede secarse.<sup>[1]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un exceso de hormona tiroidea acelera tu cuerpo. Por ejemplo, puedes perder peso aunque comas m\u00e1s de lo habitual, tu coraz\u00f3n puede latir r\u00e1pido o de forma irregular, y puedes sentir nerviosismo o dormir mal.<sup>[1]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Los s\u00edntomas var\u00edan de una persona a otra. Los problemas de tiroides suelen repetirse dentro de una misma familia, y eso puede ser un motivo para medir tu valor.<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\">Qu\u00e9 dice tu valor de T4 libre<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">La directriz del laboratorio<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">El laboratorio con el que trabaja BioProfile, Labplusarts, utiliza para la T4 libre un valor de referencia de 11,0 a 21,0 pmol\/l. El laboratorio considera normal un valor dentro de estos l\u00edmites.<sup>[2]<\/sup><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Valor de referencia de Labplusarts<\/h3>\n\n\n\n<figure class=\"wp-block-table bp-bm-table\"><table><thead><tr><th>Valor<\/th><th>Qu\u00e9 puede significar<\/th><th>Para qui\u00e9n<\/th><\/tr><\/thead><tbody><tr><td>11,0 a 21,0 pmol\/l<sup>[2]<\/sup><\/td><td>El laboratorio considera normal un valor entre estos l\u00edmites<\/td><td>Resultados medidos por Labplusarts<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"bp-bm-caption wp-block-paragraph\">Fuente: Labplusarts, el laboratorio con el que trabaja BioProfile. Valor de referencia para la T4 libre (FT4).<sup>[2]<\/sup><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">T4 libre demasiado baja<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Un valor por debajo de lo normal puede indicar una tiroides que funciona demasiado despacio. Tambi\u00e9n puede indicar una reacci\u00f3n en la que tus defensas atacan la tiroides, ciertas fases de una inflamaci\u00f3n de la tiroides, o demasiado o muy poco yodo en tu alimentaci\u00f3n. A veces se debe a la hip\u00f3fisis, pero eso es raro. En un beb\u00e9 reci\u00e9n nacido puede indicar una tiroides que funciona demasiado despacio desde el nacimiento. Un valor bajo tambi\u00e9n puede deberse a un tratamiento de la tiroides, como radioterapia, yodo radiactivo o una operaci\u00f3n.<sup>[1]<\/sup><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">T4 libre demasiado alta<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Un valor por encima de lo normal puede indicar una tiroides que trabaja demasiado. Tambi\u00e9n puede indicar una reacci\u00f3n en la que tus defensas atacan la tiroides, ciertas fases de una inflamaci\u00f3n de la tiroides, o una tiroides agrandada o un n\u00f3dulo que produce demasiada hormona. Tu m\u00e9dico suele comparar tu resultado con otros valores tiroideos para ver qu\u00e9 significa.<sup>[1]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">BioProfile est\u00e1 trabajando en sus propias zonas para cada valor, de riesgo a \u00f3ptimo. Un m\u00e9dico valora esas zonas antes de que aparezcan en tu resultado.<\/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\">Qu\u00e9 influye en tu T4 libre<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Medicamentos y suplementos<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Algunos medicamentos y suplementos pueden influir en tu resultado. Cu\u00e9ntale a tu profesional sanitario lo que tomas. No dejes ning\u00fan medicamento sin consultarlo antes.<sup>[1]<\/sup><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">La hormona tiroidea como medicamento<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u00bfTomas hormona tiroidea porque tu tiroides funciona demasiado despacio? Entonces una prueba de T4 puede mostrar lo bien que funciona ese medicamento.<sup>[1]<\/sup><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">El yodo en tu alimentaci\u00f3n<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Tomar demasiado o muy poco yodo en tu alimentaci\u00f3n puede ir unido a una T4 baja.<sup>[1]<\/sup><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Tu hip\u00f3fisis y tu cerebro<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Una T4 alterada suele deberse a la propia tiroides. A veces la causa est\u00e1 en la hip\u00f3fisis, que produce demasiada o muy poca TSH, o en el hipot\u00e1lamo, la parte de tu cerebro que controla la hip\u00f3fisis.<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\">Qu\u00e9 paquetes de BioProfile miden la T4 libre<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La T4 libre est\u00e1 incluida en BioProfile 87, 121 y 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\/es\/analisis-de-sangre\/\">Ver los paquetes<\/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\">Valores que la acompa\u00f1an<\/h2>\n\n\n\n<ul class=\"wp-block-list bp-bm-related\">\n\n<li><a href=\"https:\/\/bioprofile.com\/es\/biomarkers\/tsh\/\">TSH<\/a>: le indica a tu tiroides cu\u00e1nta hormona debe producir, y suele medirse junto con la T4.<sup>[1]<\/sup><\/li>\n\n\n<li><strong>Selenio<\/strong>: ayuda a completar el panorama, porque una prueba de T4 por s\u00ed sola no dice lo suficiente sobre tu tiroides.<sup>[1]<\/sup><\/li>\n\n\n<li><strong>Anticuerpos anti-TPO<\/strong>: encajan con la pregunta de si detr\u00e1s de una T4 alterada hay una reacci\u00f3n de tus defensas contra tu tiroides.<sup>[1]<\/sup><\/li>\n\n\n<li><strong>Yodo<\/strong>: tomar demasiado o muy poco yodo en tu alimentaci\u00f3n puede ir unido a una T4 baja.<sup>[1]<\/sup><\/li>\n\n\n<li><strong>T3 libre<\/strong>: otro valor tiroideo, porque la T4 suele valorarse junto con otras pruebas de tiroides.<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\">C\u00f3mo se ha hecho esta p\u00e1gina<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La redacci\u00f3n de BioProfile escribi\u00f3 esta p\u00e1gina el 10 de octubre de 2026 a partir de las fuentes que aparecen abajo, que le\u00edmos el 10 de octubre de 2026. Cada cifra de esta p\u00e1gina est\u00e1 en una de esas fuentes, con el n\u00famero de esa fuente al lado. Una persona experta todav\u00eda va a revisar esta p\u00e1gina; despu\u00e9s de esa revisi\u00f3n, su nombre y la fecha de la revisi\u00f3n aparecer\u00e1n arriba. Esta p\u00e1gina explica y no da un diagn\u00f3stico. Habla de un valor alterado con tu m\u00e9dico de cabecera.<\/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\">Fuentes<\/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. Thyroxine (T4) Test. Consultado el 10 de octubre de 2026. <a href=\"https:\/\/medlineplus.gov\/lab-tests\/thyroxine-t4-test\/\" target=\"_blank\" rel=\"noopener\">https:\/\/medlineplus.gov\/lab-tests\/thyroxine-t4-test\/<\/a><\/li>\n\n\n<li>Labplusarts, el laboratorio con el que trabaja BioProfile: valor de referencia en la determinaci\u00f3n de T4 libre (FT4), 11,0 a 21,0 pmol\/l. Lista del 24 de septiembre de 2026.<\/li>\n\n\n<li>BioProfile, los paquetes del an\u00e1lisis de sangre y los valores de cada paquete. <a href=\"https:\/\/bioprofile.com\/es\/analisis-de-sangre\/\" target=\"_blank\" rel=\"noopener\">https:\/\/bioprofile.com\/es\/analisis-de-sangre\/<\/a><\/li>\n\n<\/ol>\n\n<\/div>\n\n<\/section>\n\n","protected":false},"excerpt":{"rendered":"<p>Inicio \u203a Biomarcadores \u203a T4 libre T4 libre (FT4): qu\u00e9 dice tu valor sobre tu tiroides La T4 libre es la forma activa de la hormona tiroxina en tu sangre. Un valor demasiado bajo o demasiado alto puede indicar un problema en tu tiroides.[1] En esta p\u00e1gina descubrir\u00e1s qu\u00e9 es la T4 libre, qu\u00e9 dicen [&hellip;]<\/p>\n","protected":false},"author":18,"featured_media":0,"parent":6604,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"elementor_header_footer","meta":{"_yoast_wpseo_title":"T4 libre (FT4): qu\u00e9 dice tu valor | BioProfile","_yoast_wpseo_metadesc":"\u00bfQu\u00e9 es la T4 libre, qu\u00e9 puede significar un valor demasiado bajo o demasiado alto y qu\u00e9 valores conviene mirar junto a ella? 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