Thyroid
4 markers in this category
Free T3 (Triiodothyronine)
Free T3 (triiodothronine) is considered the most active thyroid hormone. It may play a key role in regulating metabolism, energy production, and body temperature. Healthcare providers often assess Free T3 alongside other thyroid markers for a comprehensive picture.
Free T4 (Thyroxine)
Free T4 (thyroxine) is the main hormone produced by the thyroid gland. It may serve as a precursor that your body converts into the more active T3. Healthcare providers often consider Free T4 a primary indicator of thyroid gland output.
TPO Antibodies
TPO antibodies target the thyroid peroxidase enzyme involved in thyroid hormone production. Elevated levels may indicate autoimmune thyroid conditions such as Hashimoto's thyroiditis. Your healthcare provider can help determine what your TPO antibody results mean for your health.
TSH (Thyroid Stimulating Hormone)
TSH is thyroid-stimulating hormone. The pituitary gland makes it, and uses it to drive your thyroid. At the laboratory that runs the test the usual adult range runs from 0.27 to 4.20 mE/L. A high TSH usually fits an underactive thyroid. A low value usually fits an overactive one. That direction feels inverted, and it is. TSH is the pituitary signal, not the thyroid hormone itself. Laboratories use slightly different limits from one another. Always read the reference value printed on your own result. And a single measurement is never a diagnosis.