{"id":27056,"date":"2025-06-24T14:39:44","date_gmt":"2025-06-24T12:39:44","guid":{"rendered":"https:\/\/www.clinica-sante.com\/ro\/analize-fara-categorie\/ft4\/"},"modified":"2026-01-05T19:06:44","modified_gmt":"2026-01-05T17:06:44","slug":"ft4","status":"publish","type":"product","link":"https:\/\/www.clinica-sante.com\/ro\/analize-imunologie\/ft4\/","title":{"rendered":"FT4"},"content":{"rendered":"

1. Descriere general\u0103<\/strong><\/p>\n

Glanda tiroid\u0103 este o gland\u0103 de dimensiuni mici, \u00een form\u0103 de fluture, situat\u0103 \u00een partea anterioar\u0103 a g\u00e2tului. Este o component\u0103 esen\u021bial\u0103 a sistemului endocrin, responsabil\u0103 de producerea hormonilor tiroidieni, care joac\u0103 un rol cheie \u00een reglarea metabolismului, cre\u0219terea, dezvoltarea \u0219i func\u021bionarea optim\u0103 a \u00eentregului organism. Hormonii tiroidieni, tiroxina (T4) \u0219i triiodotironina (T3) sunt produ\u0219i sub controlul TSH (hormonul de stimulare tiroidian\u0103) secretat de hipofiz\u0103.<\/p>\n<\/p>\n

Tiroxina (T4) este produsul principal de secrea\u021bie al glandei tiroide \u0219i este considerat un prohormon, fiind ulterior convertit \u00een T3 la nivelul \u021besuturile periferice. \u00cen s\u00e2nge, cea mai mare parte a T4 este legat\u0103 de proteinele plasmatice de transport (TBG- thyroid binding globulin, albumin\u0103) \u0219i doar o cantitate mic\u0103 circul\u0103 liber\u0103. <\/p>\n

FT4 sau tiroxina liber\u0103 reprezint\u0103 frac\u021biunea liber\u0103, biologic activ\u0103 a tiroxinei, responsabil\u0103 de efectele metabolice.<\/p>\n<\/p>\n

Printre principalele roluri ale hormonilor tiroidieni se num\u0103r\u0103: <\/p>\n

    \n
  1. Reglarea metabolismului: hormonii tiroidieni cresc rata metabolic\u0103 bazal\u0103 \u0219i consumul de oxigen, promov\u00e2nd arderea glucidelor \u0219i lipidelor pentru energie. De asemenea, ajut\u0103 la reglarea \u0219i men\u021binerea temperaturii corporale.<\/li>\n
  2. Func\u021bionarea adecvat\u0103 a sistemului nervos: sunt vitali pentru cre\u0219terea \u0219i dezvoltarea normal\u0103 a copiilor, dar au \u0219i un impact semnificativ asupra proceselor cognitive \u0219i emo\u021bionale la adul\u021bi.<\/li>\n
  3. Cresc frecven\u021ba \u0219i for\u021ba contrac\u021biilor cardiace, influen\u021b\u00e2nd astfel debitul cardiac \u0219i circula\u021bia sangvin\u0103. <\/li>\n
  4. Asigur\u0103 mineralizarea corect\u0103 a oaselor \u0219i men\u021bin masa \u0219i for\u021ba muscular\u0103.<\/li>\n
  5. Faciliteaz\u0103 procesul de digestie, prin promovarea motilit\u0103\u021bii \u0219i secre\u021biei digestive. <\/li>\n
  6. Men\u021bin echilibrul hormonal necesar pentru fertilitate \u0219i s\u0103n\u0103tatea reproductiv\u0103.<\/li>\n<\/ol>\n

    FT4 este un test de baz\u0103 pentru evaluarea func\u021biei tiroidiene \u0219i diagnosticul dezechilibrelor hormonale. Interpretarea sa trebuie realizat\u0103 \u00eempreun\u0103 cu TSH \u0219i, la nevoie, cu T3 \u0219i al\u021bi markeri specifici.<\/p>\n<\/p>\n

    2. Indica\u021bii testare<\/strong><\/p>\n

      \n
    • Evaluarea de rutin\u0103 a func\u021biei tiroidiene.<\/li>\n
    • Investigarea pacien\u021bilor cu semne\/ simptome sugestive pentru disfunc\u021bie tiroidian\u0103: oboseal\u0103 persistent\u0103, tulbur\u0103ri de tranzit intestinal, modific\u0103ri ale greut\u0103\u021bii, palpita\u021bii, intoleran\u021b\u0103 la frig sau c\u0103ldur\u0103, tulbur\u0103ri de cre\u0219tere la copii.<\/li>\n
    • Diagnosticul \u0219i monitorizarea tratamentului disfunc\u021biilor tiroidiene: hipotiroidism sau hipertiroidism (\u00eempreun\u0103 cu TSH).<\/li>\n
    • Evaluarea nodulilor tiroidieni.<\/li>\n
    • Screeningul disfunc\u021biilor tiroidiene \u00een sarcin\u0103.<\/li>\n<\/ul>\n

      3. Preg\u0103tire pacient<\/strong><\/p>\n

        \n
      • Se recomand\u0103 recoltarea diminea\u021ba a jeun (pe nem\u00e2ncate).<\/li>\n
      • La pacien\u021bii \u00een tratament cu levotiroxin\u0103, recoltarea se face \u00eenainte de administrarea dozei zilnice.<\/li>\n
      • Se recomand\u0103 informarea medicului despre tratamentele actuale.<\/li>\n<\/ul>\n

        4. Tipul probei recoltate: <\/strong>S\u00e2nge venos<\/p>\n<\/p>\n

        5. Valori de referin\u021b\u0103 <\/strong><\/p>\n

        Valorile de referin\u021b\u0103 pot varia \u00een func\u021bie de laborator \u0219i metoda de dozare.<\/p>\n

        Valorile normale ale FT4 variaz\u0103 \u00een func\u021bie de v\u00e2rst\u0103 \u0219i starea fiziologic\u0103 (sarcin\u0103).<\/p>\n

          \n
        • Adul\u021bi: 0.8-1.8 ng\/dL (10-23 pmol\/L)<\/li>\n<\/ul>\n

          6. Interpretare rezultate<\/strong><\/p>\n

          Rezultatele se interpreteaz\u0103 \u00een context clinic, al\u0103turi de valorile TSH \u0219i alte investiga\u021bii.<\/p>\n<\/p>\n

          Valori crescute<\/strong><\/p>\n

          Pot inidica hipertiroidism (exces de hormoni tiroidieni), care poate s\u0103 apar\u0103 \u00een: <\/p>\n

            \n
          • Boala Basedow-Graves (boal\u0103 tiroidian\u0103 autoimun\u0103 caracterizat\u0103 prin produc\u021bie crescut\u0103 de hormoni tiroidieni la nivelul tiroidei)<\/li>\n
          • Nodul tiroidian toxic sau gu\u0219\u0103 polinodular\u0103 toxic\u0103<\/li>\n
          • Tiroidit\u0103 subacut\u0103<\/li>\n
          • Administrare excesiv\u0103 de hormoni tiroidieni<\/li>\n
          • Tulbur\u0103ri ale glandei hipofize<\/li>\n<\/ul>\n

            \u00cen sarcin\u0103 (trimestrul I), valori u\u0219or crescute pot fi normale.<\/p>\n<\/p>\n

            Valori sc\u0103zute<\/strong><\/p>\n

            Pot inidica hipotiroidism (produc\u021bie insuficient\u0103 de hormoni tiroidieni), care poate s\u0103 apar\u0103 \u00een:<\/p>\n

              \n
            • Tiroidita Hashimoto<\/li>\n
            • Deficit de iod<\/li>\n
            • Postchirurgical sau post-terapie cu iod radioactiv<\/li>\n
            • Afec\u021biuni hipofizare<\/li>\n
            • Tratament necorespunz\u0103tor cu hormoni tiroidieni sau antitiroidiene de sintez\u0103.<\/li>\n<\/ul>\n

              7. Factori care pot influen\u021ba rezultatul<\/strong><\/p>\n

                \n
              • Medicamente: estrogeni, anticoncep\u021bionale orale, amiodaron\u0103, corticosteroizi, anticonvulsicante \u2013 pot determina cre\u0219teri sau sc\u0103deri la FT4.<\/li>\n
              • Afec\u021biuni sistemice severe \u2013 pot produce modific\u0103ri ale hormonilor tiroidieni (valori sc\u0103zute) f\u0103r\u0103 s\u0103 existe o boal\u0103 tiroidian\u0103 real\u0103 (euthyroid sick syndrome).<\/li>\n
              • Suplimentele cu biotin\u0103 \u00een doze mari \u2013 pot interfera cu metoda de dozare.<\/li>\n<\/ul>\n

                8. Analize complementare<\/strong><\/p>\n

                  \n
                • TSH \u2013 pentru evaluarea func\u021biei tiroidiene \u0219i confirmarea dezechilibrelor hormonale.<\/li>\n
                • FT3 (triiodotironin\u0103 liber\u0103), T3 total \u2013 pentru completarea diagnosticului, mai ales \u00een hipertiroidism.<\/li>\n
                • Anticorpi antitiroidieni (anti-TPO, anti-tiroglobulina, TRAb) \u2013 \u00een suspiciunea de boal\u0103 autoimun\u0103.<\/li>\n
                • Ecografie tiroidian\u0103 \u2013 pentru evaluarea structurii glandei tiroide.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

                  FT4 (tiroxina liber\u0103) m\u0103soar\u0103 frac\u021biunea liber\u0103, biologic activ\u0103 a hormonului tiroidian T4. Al\u0103turi de TSH, este un test de baz\u0103 \u00een evaluarea func\u021biei tiroidiene, diagnosticarea \u0219i monitorizarea disfunc\u021biilor tiroidiene precum hipotiroidismul sau hipertiroidismul \u0219i ajustarea tratamentului acestor pacien\u021bi.<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"_acf_changed":false,"inline_featured_image":false},"product_brand":[],"product_cat":[1209,3180,2876],"product_tag":[3828,3822,3824,3442,3441,3440,3826,3829,3825,3443,3823,3827],"class_list":{"0":"post-27056","1":"product","2":"type-product","3":"status-publish","5":"product_cat-analize","6":"product_cat-imunologie","7":"product_cat-serviciu-laborator","8":"product_tag-free-t4","9":"product_tag-ft4","10":"product_tag-glanda-tiroida","11":"product_tag-hipertiroidism","12":"product_tag-hipotiroidism","13":"product_tag-hormoni-tiroidieni","14":"product_tag-t3","15":"product_tag-t4-liber","16":"product_tag-tiroidita-autoimuna","17":"product_tag-tiroidita-hashimoto","18":"product_tag-tiroxina-libera","19":"product_tag-tsh","20":"pa_conditii-medicale-afecti-aritmii-cardiace","21":"pa_conditii-medicale-afecti-boala-basedow-graves","22":"pa_conditii-medicale-afecti-cancer-tiroidian","23":"pa_conditii-medicale-afecti-ginecomastie","24":"pa_conditii-medicale-afecti-hipertiroidism","25":"pa_conditii-medicale-afecti-hipotiroidism","26":"pa_conditii-medicale-afecti-miopatii-endocrine","27":"pa_conditii-medicale-afecti-nodul-tiroidian","28":"pa_conditii-medicale-afecti-oftalmopatie-graves-din-hipertiroidism","29":"pa_conditii-medicale-afecti-tiroidita-cronica-autoimuna","30":"pa_conditii-medicale-afecti-tulburari-de-ciclu-menstrual-amenoree-sopc","31":"pa_conditii-medicale-afecti-tumori-hipofizare","32":"pa_parti-ale-corpului-organ-glanda-tiroida","33":"pa_parti-ale-corpului-organ-ochi","34":"pa_parti-ale-corpului-siste-analizori","35":"pa_parti-ale-corpului-siste-sistem-endocrin","37":"first","38":"instock","39":"sale","40":"virtual","41":"purchasable","42":"product-type-simple"},"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.clinica-sante.com\/ro\/wp-json\/wp\/v2\/product\/27056","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.clinica-sante.com\/ro\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.clinica-sante.com\/ro\/wp-json\/wp\/v2\/types\/product"}],"wp:attachment":[{"href":"https:\/\/www.clinica-sante.com\/ro\/wp-json\/wp\/v2\/media?parent=27056"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.clinica-sante.com\/ro\/wp-json\/wp\/v2\/product_brand?post=27056"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.clinica-sante.com\/ro\/wp-json\/wp\/v2\/product_cat?post=27056"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.clinica-sante.com\/ro\/wp-json\/wp\/v2\/product_tag?post=27056"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}