{"id":221,"date":"2025-06-11T12:41:35","date_gmt":"2025-06-11T12:41:35","guid":{"rendered":"https:\/\/analizesanocare.ro\/?post_type=product&#038;p=221"},"modified":"2025-08-08T13:57:32","modified_gmt":"2025-08-08T13:57:32","slug":"ft3-triiodotironina-libera","status":"publish","type":"product","link":"https:\/\/analizesanocare.ro\/en\/analiz\u0103\/ft3-triiodotironina-libera\/","title":{"rendered":"FT3 (Triiodotironina liber\u0103)"},"content":{"rendered":"<div class=\"info-content content-informatii-generale\">\n<h2><strong>Informa\u0163ii generale: FT3 (Triiodotironina liber\u0103)<\/strong><\/h2>\n<p>Aproximativ 80% din triiodotironina (<a href=\"https:\/\/www.synevo.ro\/shop\/t3-triiodotironina\/\" target=\"_blank\" rel=\"noopener noreferrer\" data-wpel-link=\"internal\">T3<\/a>) circulant\u0103 rezult\u0103 din conversia periferic\u0103 a tiroxinei (<a href=\"https:\/\/www.synevo.ro\/shop\/t4-tiroxina-totala\/\" target=\"_blank\" rel=\"noopener noreferrer\" data-wpel-link=\"internal\">T4<\/a>), restul de 20% fiind produs ca atare de glanda tiroid\u0103. Numai 0.1-0.3 % din <a href=\"https:\/\/www.synevo.ro\/shop\/t3-triiodotironina\/\" target=\"_blank\" rel=\"noopener noreferrer\" data-wpel-link=\"internal\">T3<\/a> seric se g\u0103se\u015fte sub form\u0103 liber\u0103 (free T3) fiziologic activ\u0103, majoritatea fiind legat\u0103 de proteinele plasmatice (\u00een principal TBG). Determinarea FT3 prezint\u0103 astfel avantajul c\u0103 este independent\u0103 de modific\u0103rile survenite \u00een concentra\u0163ia \u015fi \u00een propriet\u0103\u0163ile de legare ale proteinelor plasmatice.<\/p>\n<p>Activitatea metabolic\u0103 a FT3 este de cinci ori mai mare dec\u00e2t activitatea <a href=\"https:\/\/www.synevo.ro\/shop\/ft4-tiroxina-libera\/\" target=\"_blank\" rel=\"noopener noreferrer\" data-wpel-link=\"internal\">FT4<\/a>.<\/p>\n<p>Concentra\u0163iile serice de T3 \u015fi FT3 depind \u00een mod esen\u0163ial de rata de conversie periferic\u0103 <a href=\"https:\/\/www.synevo.ro\/shop\/t4-tiroxina-totala\/\" target=\"_blank\" rel=\"noopener noreferrer\" data-wpel-link=\"internal\">T4<\/a>\u2192<a href=\"https:\/\/www.synevo.ro\/shop\/t3-triiodotironina\/\" target=\"_blank\" rel=\"noopener noreferrer\" data-wpel-link=\"internal\">T3<\/a>. Rata de conversie poate fi diminuat\u0103:<\/p>\n<ul>\n<li>\u00een afec\u0163iuni sistemice severe de cauza non-tiroidian\u0103 (neoplazii \u00een stadii avansate, ciroz\u0103 hepatic\u0103 decompensat\u0103, insuficien\u0163\u0103 renal\u0103 \u00een stadiu terminal, sepsis, anorexie nervoas\u0103) ce pot determina \u201csindromul T3 sc\u0103zut\u201d caracterizat prin sc\u0103derea T3\/FT3 \u015fi cre\u015fterea unui stereoizomer inactiv \u2013 \u201ereverse\u201d T3 (rT3), prin \u201credirec\u0163ionarea\u201d conversiei T4;<\/li>\n<li>ca urmare a administr\u0103rii unor medicamente: corticosteroizi, propranolol \u015fi amiodarona;<\/li>\n<li>la persoanele v\u00e2rstnice: concentra\u0163iile de T3\/ FT3 sunt cu 10-50% mai sc\u0103zute fa\u0163\u0103 de cele ale persoanelor mai tinere (din acest motiv, o form\u0103 u\u015foar\u0103 de hipertiroidism ar putea fi trecut\u0103 cu vederea la ace\u015fti pacien\u0163i).<\/li>\n<\/ul>\n<p>In prezen\u0163a unui deficit de iod se poate \u00eenregistra o cre\u015ftere compensatorie\u00a0 de T3\/FT3<sup>1;3<\/sup>.<\/p>\n<h2><strong>Recomand\u0103ri pentru determinarea FT3<\/strong><\/h2>\n<ul>\n<li>depistarea unei secre\u0163ii izolate de triiodotironina (<a href=\"https:\/\/www.synevo.ro\/hipertiroidism-tulburare-hormonilor-tiroidieni\/\" data-wpel-link=\"internal\">hipertiroidism<\/a> T3), ce poate ap\u0103rea \u00een aproximativ 10% din cazurile de hipertiroidism;<\/li>\n<li>identificarea pacien\u0163ilor cu hipertiroidism subclinic, care prezint\u0103 supresie de TSH \u015fi concentra\u0163ii normale de <a href=\"https:\/\/www.synevo.ro\/shop\/ft4-tiroxina-libera\/\" target=\"_blank\" rel=\"noopener noreferrer\" data-wpel-link=\"internal\">FT4<\/a> \u015fi FT3; ace\u015fti indivizi au risc crescut de a dezvolta hipertiroidism clinic manifest;<\/li>\n<li>stabilirea prognosticului la pacien\u0163ii cu <a href=\"https:\/\/www.synevo.ro\/boala-graves-diagnostic-clinic-laborator\/\" data-wpel-link=\"internal\">boala Basedow Graves<\/a> (o concentra\u0163ie crescut\u0103 de FT3 inainte de ini\u0163ierea terapiei indic\u0103 o rat\u0103 crescut\u0103 de rec\u0103deri);<\/li>\n<li>pentru depistarea rec\u0103derii bolii la pacien\u0163ii cu hipertiroidism (cre\u015fterea FT3 poate fi un semn precoce);<\/li>\n<li>evaluarea severit\u0103\u0163ii unui hipotiroidism primar;<\/li>\n<li>monitorizarea tratamentului cu levotiroxin\u0103 (pentru evitarea supradoz\u0103rii)<sup>3<\/sup>.<\/li>\n<\/ul>\n<p><strong>Preg\u0103tire pacient <\/strong>\u2013 \u00e0 jeun<sup>1<\/sup>.<strong>\u00a0<\/strong><\/p>\n<p><strong>Specimen recoltat <\/strong>\u2013 s\u00e2nge venos<sup>1<\/sup>.<\/p>\n<p><strong>Recipient de recoltare <\/strong>\u2013 vacutainer f\u0103r\u0103 anticoagulant, cu\/f\u0103r\u0103 gel separator<sup>1<\/sup>.<\/p>\n<p><strong>Prelucrare necesar\u0103 dup\u0103 recoltare <\/strong>\u2013 se separ\u0103 serul prin centrifugare; se lucreaz\u0103 serul proasp\u0103t; dac\u0103 acest lucru nu este posibil, serul se p\u0103streaz\u0103 la 2-8\u00b0C sau la -20\u00b0C<sup>1<\/sup>.<\/p>\n<p><strong>Volum prob\u0103<\/strong> \u2013 minim 0.5 mL ser<sup>1<\/sup>.<\/p>\n<p><strong>Cauze de respingere<\/strong> <strong>a probei <\/strong>\u2013 specimen intens lipemic sau hemolizat<sup>1<\/sup>.<\/p>\n<p><strong>Stabilitate prob\u0103 <\/strong>\u2013 serul separat este stabil 7 zile la 2-8\u00b0C; 1 luna la -20\u00b0C; nu decongela\u0163i\/recongela\u0163i<sup>1<\/sup>.<\/p>\n<p><strong>Metod\u0103 <\/strong>\u2013 imunochimic\u0103 cu detec\u0163ie prin electrochemiluminiscen\u0163\u0103 (ECLIA)<sup>1<\/sup>.<\/p>\n<h2><b>Valori de referin\u0163\u0103 FT3 (Triiodotironina liber\u0103)<\/b><\/h2>\n<div>\n<table class=\"wp-block-table w-100\" border=\"1\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td width=\"96\">\n<p align=\"center\"><b>V\u00e2rst\u0103<\/b><\/p>\n<\/td>\n<td width=\"156\">\n<p align=\"center\"><b>Valori de referin\u0163\u0103 (pmol\/L)<\/b><\/p>\n<\/td>\n<td valign=\"top\" width=\"156\">\n<p align=\"center\"><b>Valori de referin\u0163\u0103 (pg\/mL)<\/b><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td width=\"96\">\n<p align=\"center\">0-6 zile<\/p>\n<\/td>\n<td width=\"156\">\n<p align=\"center\">2.65-9.68<\/p>\n<\/td>\n<td valign=\"top\" width=\"156\">\n<p align=\"center\">1.73-6.30<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td width=\"96\">\n<p align=\"center\">6 zile-3 luni<\/p>\n<\/td>\n<td width=\"156\">\n<p align=\"center\">3.0-9.28<\/p>\n<\/td>\n<td valign=\"top\" width=\"156\">\n<p align=\"center\">1.95-6.04<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td width=\"96\">\n<p align=\"center\">3-12 luni<\/p>\n<\/td>\n<td width=\"156\">\n<p align=\"center\">3.30-8.95<\/p>\n<\/td>\n<td valign=\"top\" width=\"156\">\n<p align=\"center\">2.15-5.83<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td width=\"96\">\n<p align=\"center\">1-6 ani<\/p>\n<\/td>\n<td width=\"156\">\n<p align=\"center\">3.69-8.46<\/p>\n<\/td>\n<td valign=\"top\" width=\"156\">\n<p align=\"center\">2.41-5.50<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td width=\"96\">\n<p align=\"center\">6-11 ani<\/p>\n<\/td>\n<td width=\"156\">\n<p align=\"center\">3.88-8.02<\/p>\n<\/td>\n<td valign=\"top\" width=\"156\">\n<p align=\"center\">2.53-5.22<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td width=\"96\">\n<p align=\"center\">11-20 ani<\/p>\n<\/td>\n<td width=\"156\">\n<p align=\"center\">3.93-7.70<\/p>\n<\/td>\n<td valign=\"top\" width=\"156\">\n<p align=\"center\">2.56-5.01<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td width=\"96\">\n<p align=\"center\">&gt; 20 ani<\/p>\n<\/td>\n<td width=\"156\">\n<p align=\"center\">3.4-6.8<\/p>\n<\/td>\n<td valign=\"top\" width=\"156\">\n<p align=\"center\">2.21-4.43<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>&nbsp;<\/p>\n<p>Femeile gravide au concentra\u0163ii de FT3 mai sc\u0103zute, corelate cu v\u00e2rsta gesta\u0163ional\u0103:<\/p>\n<div>\u2013 trimestrul I: 3.78-5.97 pmol\/L\u00a0 (2.46-3.89 pg\/mL);<\/div>\n<div>\u2013 trimestrul II: 3.21-5.45 pmol\/L\u00a0 (2.09-3.55 pg\/mL);<\/div>\n<div>\u2013 trimestrul III: 3.09-5.03 pmol\/L\u00a0 (2.01-3.27 pg\/mL).<\/div>\n<p>Factori de conversie: pmol\/L x 0.651=pg\/mL;\u00a0 pg\/mL x 1.536=pmol\/L;\u00a0 pg\/mL x 0.1=ng\/dL.<\/p>\n<p><strong>Limita de detec\u0163ie<\/strong> \u2013 0.4 pmol\/L (0.260 pg\/mL)<sup>1<\/sup>.<\/p>\n<p><strong>Limite \u015fi interferen\u0163e<\/strong><\/p>\n<p>La pacien\u0163ii cu afec\u0163iuni non-tiroidiene un nivel sc\u0103zut de FT3 reprezint\u0103 un rezultat nespecific<sup>2<\/sup>.<\/p>\n<p>\u2022 Interferen\u0163e analitice<\/p>\n<p>Pot produce interferen\u0163e cu unele componente ale kit-ului \u015fi conduce la rezultate neconcludente urm\u0103toarele:<\/p>\n<ul>\n<li>\u00a0autoanticorpii fa\u0163\u0103 de hormonii tiroidieni;<\/li>\n<li>tratamentul cu biotin\u0103 \u00een doze mari (&gt;5 mg\/zi); de aceea se recomand\u0103 ca recoltarea de s\u00e2nge s\u0103 se fac\u0103 dup\u0103 minimum 8 ore de la ultima administrare;<\/li>\n<li>titrurile foarte crescute de anticorpi anti-streptavidina \u015fi anti-ruteniu<sup>1<\/sup>.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2><strong>Bibliografie<\/strong><\/h2>\n<div>1. Laborator Synevo. Referin\u0163ele specifice tehnologiei de lucru utilizate. 2010. Ref Type: Catalog.<\/div>\n<div>2. Laboratory Corporation of America. Directory of Services and Interpretive Guide. Tri-iodothyronine (T3), Free, Serum. <a href=\"https:\/\/www.labcorp.com\/\" target=\"_blank\" rel=\"noopener nofollow external noreferrer\" data-wpel-link=\"external\">www.labcorp.com<\/a> 2010. Ref Type: Internet Communication.<\/div>\n<div>3. Lothar Thomas.Thyriod Function. In Clinical Laboratory Diagnostics-Use and Assessment of Clinical Laboratory Results. TH-Books Verlagsgesellschaft mbH, Frankfurt \/Main, Germany, 1 Ed., 1998, 1017-1019.<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Informa\u0163ii generale: FT3 (Triiodotironina liber\u0103) Aproximativ 80% din triiodotironina (T3) circulant\u0103 rezult\u0103 din conversia periferic\u0103 a tiroxinei (T4), restul de 20% fiind produs ca atare de glanda tiroid\u0103. Numai 0.1-0.3 % din T3 seric se g\u0103se\u015fte sub form\u0103 liber\u0103 (free T3) fiziologic activ\u0103, majoritatea fiind legat\u0103 de proteinele plasmatice (\u00een principal TBG). Determinarea FT3 prezint\u0103 [&hellip;]<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"_acf_changed":false},"product_brand":[],"product_cat":[36,74],"product_tag":[],"class_list":["post-221","product","type-product","status-publish","product_cat-markeri-endochrini","product_cat-markeri-tiroidieni","first","instock","shipping-taxable","purchasable","product-type-simple"],"acf":[],"_links":{"self":[{"href":"https:\/\/analizesanocare.ro\/en\/wp-json\/wp\/v2\/product\/221","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/analizesanocare.ro\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/analizesanocare.ro\/en\/wp-json\/wp\/v2\/types\/product"}],"wp:attachment":[{"href":"https:\/\/analizesanocare.ro\/en\/wp-json\/wp\/v2\/media?parent=221"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/analizesanocare.ro\/en\/wp-json\/wp\/v2\/product_brand?post=221"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/analizesanocare.ro\/en\/wp-json\/wp\/v2\/product_cat?post=221"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/analizesanocare.ro\/en\/wp-json\/wp\/v2\/product_tag?post=221"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}