Free T4 — lab reference
Some search terms matchedBinding abnormalities and severe illness may affect some free-hormone assays.
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What’s searchable?Free T3 — lab reference
Some search terms matchedUseful in selected hyperthyroid states; not a sensitive stand-alone test for hypothyroidism.
Total T4 — lab reference
Some search terms matchedAffected by thyroid-binding globulin, pregnancy, estrogen, and medications.
Total T3 — lab reference
Some search terms matchedAffected by binding proteins and nonthyroidal illness.
Reverse T3 — lab reference
Some search terms matchedNo broadly accepted treatment target. Dr. Purser to define whether and how this is used.
Thyroperoxidase antibody (TPO Ab) — lab reference
Some search terms matchedAssay-specific. Positive result supports thyroid autoimmunity but does not determine treatment alone.
Thyroglobulin antibody (Tg Ab) — lab reference
Some search terms matchedAssay-specific. Also affects thyroglobulin tumor-marker interpretation.
TSI / TRAb — lab reference
Some search terms matchedUse the exact assay cutoff. Helpful in selected Graves disease questions.
Thyroglobulin — lab reference
Some search terms matchedNot a general thyroid wellness target. Use tumor follow-up, thyroid anatomy, and antibody status.
Serum iron — lab reference
Some search terms matchedMorning fasting collection is preferred when practical. Day-to-day variation is substantial.
Total iron-binding capacity (TIBC) — lab reference
Some search terms matchedInterpret with iron, transferrin saturation, and ferritin.
Transferrin — lab reference
Some search terms matchedNegative acute-phase reactant; affected by liver function and nutrition.
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