Thyroid tests measure the hormones that set your metabolic rate and the antibodies that indicate autoimmune thyroid activity. A TSH alone is a screening number; free T4, free T3, reverse T3 and thyroid antibodies show how well the gland is producing, how the body is converting T4 to active T3, and whether the immune system is involved. These tests are commonly ordered for fatigue, weight change, temperature intolerance, hair thinning, or to monitor an existing thyroid condition or medication dose.
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Comprehensive thyroid function panel including TSH, free T4, free T3, reverse T3, and thyroid antibodies to evaluate thyroid function, metabolism, and…
Inactive thyroid hormone metabolite associated with stress, illness, and altered T4-to-T3 conversion.
Direct measurement of FT3 by equilibrium dialysis, high-pressure liquid chromatography, and tandem mass spectrometry (ED-HPLC/MS-MS) provides enhanced accuracy…
Total thyroxine (T4) with thyroid-stimulating hormone (TSH) in one draw — the classic two-marker screen of thyroid function and pituitary signaling.
Labcorp's combined thyroid profile: TSH, total T4, total T3, T3 uptake, and the calculated free thyroxine index (FTI). A single-code screen of overall thyroid…
Primary pituitary regulator of thyroid hormone production and a key marker of thyroid axis function.
Measures unbound T4 available for conversion and tissue activity.
Measures total circulating T4, including protein-bound and unbound hormone.
Measures active thyroid hormone available to tissues.
Measures total circulating T3, including protein-bound and unbound hormone.
Combined thyroid function panel measuring thyroid-stimulating hormone (TSH) and free thyroxine (T4). Essential for evaluating thyroid function, diagnosing…
