{"id":15783,"date":"2026-11-10T06:00:00","date_gmt":"2026-11-10T06:00:00","guid":{"rendered":"https:\/\/bioprofile.com\/?page_id=15783"},"modified":"2026-11-10T06:25:12","modified_gmt":"2026-11-10T06:25:12","slug":"ratio-t3-libre-t4-libre","status":"publish","type":"page","link":"https:\/\/bioprofile.com\/es\/biomarkers\/ratio-t3-libre-t4-libre\/","title":{"rendered":"Ratio T3 libre\/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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Triiodothyronine (T3) Tests. Geraadpleegd op 8 november 2026.\",\"url\":\"https:\/\/medlineplus.gov\/lab-tests\/triiodothyronine-t3-tests\/\"},{\"@type\":\"CreativeWork\",\"name\":\"MedlinePlus, U.S. National Library of Medicine. Thyroxine (T4) Test. Geraadpleegd op 8 november 2026.\",\"url\":\"https:\/\/medlineplus.gov\/lab-tests\/thyroxine-t4-test\/\"},{\"@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\/ft3-ft4-ratio\/#biomarker\",\"name\":\"Vrij T3\/vrij T4-ratio\",\"alternateName\":[\"Free T3\/free T4 ratio\"]}]}<\/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>Ratio T3 libre\/T4 libre<\/span><\/p>\n\n\n\n<h1 class=\"wp-block-heading bp-adv-h1\">Ratio T3 libre\/T4 libre: \u00bfqu\u00e9 dice tu valor?<\/h1>\n\n\n\n<p class=\"bp-adv-standfirst wp-block-paragraph\">La ratio T3 libre\/T4 libre pone una junto a otra las dos hormonas de tu tiroides, en la forma libre que puede entrar en tus tejidos. Una T3 alta puede indicar una tiroides que produce demasiada hormona. Una T4 baja puede indicar una tiroides que produce demasiado poca.<sup>[1, 2]<\/sup><\/p>\n\n\n\n<p class=\"bp-adv-lede wp-block-paragraph\">En esta p\u00e1gina te explicamos qu\u00e9 es la ratio T3 libre\/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 otros valores conviene mirar junto a este.<\/p>\n\n\n\n<p class=\"bp-bm-names wp-block-paragraph\">Tambi\u00e9n se conoce como: ratio FT3\/FT4, la relaci\u00f3n entre la T3 libre y la T4 libre. En el laboratorio: no aplica.<\/p>\n\n\n\n<p class=\"bp-adv-byline wp-block-paragraph\">Actualizado el 8 de noviembre 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-ft3-ft4-ratio\">\u00bfQu\u00e9 es la ratio T3 libre\/T4 libre?<\/a><\/li>\n\n\n<li><a href=\"#bp-waarom-het-ertoe-doet\">Por qu\u00e9 importan tus hormonas tiroideas<\/a><\/li>\n\n\n<li><a href=\"#bp-wat-je-waarde-zegt\">Qu\u00e9 dice tu valor de la ratio T3 libre\/T4 libre<\/a><\/li>\n\n\n<li><a href=\"#bp-wat-het-beinvloedt\">Qu\u00e9 influye en tu ratio T3 libre\/T4 libre<\/a><\/li>\n\n\n<li><a href=\"#bp-welke-pakketten\">Qu\u00e9 paquetes de BioProfile miden la ratio T3 libre\/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 T3 libre y la T4 libre son las formas activas de las dos hormonas que produce tu tiroides.<sup>[1, 2]<\/sup><\/li>\n\n\n<li>Una T3 alta puede indicar demasiada hormona tiroidea, y una T3 baja, demasiado poca.<sup>[1]<\/sup><\/li>\n\n\n<li>Tu m\u00e9dico suele comparar la T3 con la TSH y la T4, porque cada combinaci\u00f3n de alto, bajo y normal apunta a algo distinto.<sup>[1]<\/sup><\/li>\n\n\n<li>Algunos medicamentos y suplementos pueden influir en tu resultado, as\u00ed que nunca dejes un medicamento por tu cuenta sin hablarlo antes con tu m\u00e9dico.<sup>[2, 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-ft3-ft4-ratio\">\u00bfQu\u00e9 es la ratio T3 libre\/T4 libre?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Tu tiroides es una gl\u00e1ndula peque\u00f1a con forma de mariposa, en la parte delantera del cuello. Esta gl\u00e1ndula produce dos hormonas: T3 y T4. Juntas regulan c\u00f3mo usa tu cuerpo la energ\u00eda. La T4 es la hormona principal.<sup>[1, 2]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Las dos hormonas est\u00e1n en tu sangre de dos formas. Una parte va unida a prote\u00ednas y no puede entrar en tus tejidos. La mayor parte de la T3 va unida as\u00ed. La parte libre es la forma activa, la que entra en tus tejidos donde se necesita. La T4 unida se queda en tu sangre como reserva. La ratio compara las dos formas libres entre s\u00ed.<sup>[1, 2]<\/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 importan tus hormonas tiroideas<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Las hormonas tiroideas llegan a casi todos los \u00f3rganos de tu cuerpo. 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 regulan el crecimiento.<sup>[2]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un exceso de hormona pone tu cuerpo a un ritmo m\u00e1s alto. Puedes notar entonces el coraz\u00f3n r\u00e1pido o irregular, sentir nervios, dormir mal o sudar mucho. Si falta hormona, tu cuerpo se ralentiza. Piensa en cansancio, sentir fr\u00edo con facilidad, piel seca y un ritmo card\u00edaco lento.<sup>[2]<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un valor suelto dice poco. Seg\u00fan MedlinePlus, una prueba de T4 por s\u00ed sola no da suficiente informaci\u00f3n sobre tu tiroides. Por eso tu m\u00e9dico pone el resultado junto a la TSH y otras pruebas de tiroides.<sup>[2, 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 ratio T3 libre\/T4 libre<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Qu\u00e9 dice MedlinePlus sobre los valores tiroideos<\/h3>\n\n\n\n<figure class=\"wp-block-table bp-bm-table\"><table><thead><tr><th>Resultado tal como lo indica la fuente<\/th><th>Puede indicar<\/th><th>Para qui\u00e9n<\/th><\/tr><\/thead><tbody><tr><td>T3 alta, TSH baja y T4 libre alta<sup>[1]<\/sup><\/td><td>Un problema en la propia tiroides que hace que produzca demasiada hormona<\/td><td>General; la fuente no menciona ning\u00fan grupo<\/td><\/tr><tr><td>T3 alta, TSH normal o alta y T4 libre alta<sup>[1]<\/sup><\/td><td>Un trastorno de la hip\u00f3fisis que hace que haya demasiada hormona tiroidea<\/td><td>General; la fuente no menciona ning\u00fan grupo<\/td><\/tr><tr><td>T3 baja o normal, TSH alta y T4 libre baja<sup>[1]<\/sup><\/td><td>Un problema en la propia tiroides que hace que produzca demasiado poca hormona<\/td><td>General; la fuente no menciona ning\u00fan grupo<\/td><\/tr><tr><td>T3 baja o normal, TSH baja y T4 libre baja<sup>[1]<\/sup><\/td><td>Un trastorno de la hip\u00f3fisis que hace que haya demasiado poca hormona tiroidea<\/td><td>General; la fuente no menciona ning\u00fan grupo<\/td><\/tr><tr><td>T3 normal, TSH normal y T4 libre normal<sup>[1]<\/sup><\/td><td>En ese caso, un trastorno de la tiroides es menos probable<\/td><td>General; la fuente no menciona ning\u00fan grupo<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"bp-bm-caption wp-block-paragraph\">Fuente: MedlinePlus, Triiodothyronine (T3) Tests. Combinaciones de T3, T4 libre y TSH en general. La fuente no da valores l\u00edmite y no describe la ratio en s\u00ed.<sup>[1]<\/sup><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ratio T3 libre\/T4 libre demasiado alta<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Una ratio m\u00e1s alta significa que en tu sangre hay, en proporci\u00f3n, m\u00e1s T3 libre que T4 libre. MedlinePlus no da un l\u00edmite para la ratio en s\u00ed. Seg\u00fan la fuente, una T3 alta puede indicar una tiroides que produce demasiada hormona. Si adem\u00e1s hay una TSH baja y una T4 libre alta, puede indicar un problema en la propia tiroides. Con una TSH normal o alta, puede indicar una causa en la hip\u00f3fisis.<sup>[1]<\/sup><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ratio T3 libre\/T4 libre demasiado baja<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Una ratio m\u00e1s baja significa que, en proporci\u00f3n, hay menos T3 libre que T4 libre. Para esto, las fuentes tampoco indican ning\u00fan l\u00edmite. Una T3 baja puede indicar que la tiroides produce muy poca hormona. Aun as\u00ed, seg\u00fan MedlinePlus, la T3 no se usa a menudo para detectarlo, porque otras pruebas de tiroides lo detectan antes. Una T4 baja puede indicar muy poca hormona, ciertas fases de una inflamaci\u00f3n de la tiroides o demasiado o muy poco yodo en tu alimentaci\u00f3n.<sup>[1, 2]<\/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 ratio T3 libre\/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 m\u00e9dico lo que tomas. No dejes un medicamento por tu cuenta: tu m\u00e9dico te dir\u00e1 si hace falta.<sup>[2, 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\">Si tomas hormona tiroidea como medicamento, una prueba de T3 puede mostrar si tu dosis mantiene tus valores en un rango saludable. Una prueba de T4 muestra lo bien que funciona el medicamento. El tratamiento de una tiroides que produce demasiada hormona, como el yodo radiactivo o una operaci\u00f3n de tiroides, puede bajar tu T4.<sup>[1, 2]<\/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\">Seg\u00fan MedlinePlus, tomar demasiado o demasiado poco yodo en tu alimentaci\u00f3n puede ser una causa de una T4 m\u00e1s baja.<sup>[2]<\/sup><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Tu tiroides y tu hip\u00f3fisis<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Tu hip\u00f3fisis produce TSH, la hormona que le indica a tu tiroides cu\u00e1nta tiene que producir. Si tu T4 est\u00e1 demasiado baja, tu hip\u00f3fisis produce m\u00e1s TSH. Si tu T4 est\u00e1 demasiado alta, deja de producir TSH. Una inflamaci\u00f3n de la tiroides puede bajar tu T4 en ciertas fases y subirla en otras. Los n\u00f3dulos en la tiroides o una tiroides agrandada tambi\u00e9n pueden provocar a veces una T4 alta.<sup>[2]<\/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 ratio T3 libre\/T4 libre<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La ratio T3 libre\/T4 libre est\u00e1 incluida en BioProfile 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>: la hormona de tu hip\u00f3fisis que le indica a tu tiroides cu\u00e1nta hormona tiene que producir. Tu m\u00e9dico suele leer la T3 y la T4 junto con la TSH.<sup>[1, 2]<\/sup><\/li>\n\n\n<li><strong>Selenio<\/strong>: un mineral que puedes poner junto a tus valores tiroideos para tener una visi\u00f3n m\u00e1s amplia.<\/li>\n\n\n<li><a href=\"https:\/\/bioprofile.com\/es\/biomarkers\/t4-libre\/\">T4 libre<\/a>: la forma activa de la hormona principal de tu tiroides, y uno de los dos valores que forman la ratio.<sup>[2]<\/sup><\/li>\n\n\n<li><strong>Anticuerpos anti-TPO<\/strong>: un valor sobre tus defensas y tu tiroides que tu m\u00e9dico puede tener en cuenta para interpretar mejor tus valores tiroideos.<\/li>\n\n\n<li><strong>Yodo<\/strong>: seg\u00fan MedlinePlus, tomar demasiado o demasiado poco yodo en tu alimentaci\u00f3n puede ir unido a una T4 m\u00e1s baja.<sup>[2]<\/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\">El equipo editorial de BioProfile escribi\u00f3 esta p\u00e1gina el 8 de noviembre de 2026 a partir de las fuentes que aparecen abajo, que le\u00edmos el 8 de noviembre de 2026. Cada cifra de esta p\u00e1gina aparece en una de esas fuentes, con el n\u00famero de la fuente al lado. Una persona experta todav\u00eda tiene que revisar esta p\u00e1gina; tras esa revisi\u00f3n, el nombre de esa persona y la fecha de la revisi\u00f3n aparecer\u00e1n arriba. Esta p\u00e1gina explica y no da un diagn\u00f3stico. Habla de un valor fuera de lo normal 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. Triiodothyronine (T3) Tests. Consultado el 8 de noviembre de 2026. <a href=\"https:\/\/medlineplus.gov\/lab-tests\/triiodothyronine-t3-tests\/\" target=\"_blank\" rel=\"noopener\">https:\/\/medlineplus.gov\/lab-tests\/triiodothyronine-t3-tests\/<\/a><\/li>\n\n\n<li>MedlinePlus, U.S. National Library of Medicine. Thyroxine (T4) Test. Consultado el 8 de noviembre 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>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 Ratio T3 libre\/T4 libre Ratio T3 libre\/T4 libre: \u00bfqu\u00e9 dice tu valor? La ratio T3 libre\/T4 libre pone una junto a otra las dos hormonas de tu tiroides, en la forma libre que puede entrar en tus tejidos. Una T3 alta puede indicar una tiroides que produce demasiada hormona. Una T4 [&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":"Ratio T3 libre\/T4 libre: \u00bfqu\u00e9 dice tu valor? | BioProfile","_yoast_wpseo_metadesc":"Qu\u00e9 es la ratio T3 libre\/T4 libre, qu\u00e9 dice MedlinePlus sobre la T3 y la T4 altas y bajas, qu\u00e9 influye en tu valor y qu\u00e9 otros valores conviene mirar a su lado.","_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-15783","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>Ratio T3 libre\/T4 libre: \u00bfqu\u00e9 dice tu valor? | BioProfile<\/title>\n<meta name=\"description\" content=\"Qu\u00e9 es la ratio T3 libre\/T4 libre, qu\u00e9 dice MedlinePlus sobre la T3 y la T4 altas y bajas, qu\u00e9 influye en tu valor y qu\u00e9 otros valores conviene mirar a su lado.\" \/>\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\/es\/biomarkers\/ratio-t3-libre-t4-libre\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ratio T3 libre\/T4 libre: \u00bfqu\u00e9 dice tu valor? 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