Free T3 — lab reference
Useful in selected hyperthyroid states; not a sensitive stand-alone test for hypothyroidism.
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What’s searchable?Total T4 — lab reference
Affected by thyroid-binding globulin, pregnancy, estrogen, and medications.
Total T3 — lab reference
Affected by binding proteins and nonthyroidal illness.
Reverse T3 — lab reference
No broadly accepted treatment target. Dr. Purser to define whether and how this is used.
Thyroperoxidase antibody (TPO Ab) — lab reference
The test method matters. Positive result supports thyroid autoimmunity but does not determine treatment alone.
Thyroglobulin antibody (Tg Ab) — lab reference
The test method matters. Also affects thyroglobulin tumor-marker interpretation.
TSI / TRAb — lab reference
Ask your clinician to use the exact assay cutoff. Helpful in selected Graves disease questions.
Thyroglobulin — lab reference
This is not a general thyroid wellness target. It may be used for follow-up after certain thyroid conditions, alongside thyroid anatomy and antibody results.
Testosterone, total — lab reference
Morning collection preferred for men. Method and age matter; confirm unexpected low values.
Testosterone, free — lab reference
Mayo example age 20-24: M 5.25-20.7; F <0.13-1.08. Declines with age and is method-dependent.
Testosterone, bioavailable — lab reference
Depends on total testosterone, SHBG, albumin, calculation, and assay.
Sex hormone-binding globulin (SHBG) — lab reference
Estrogen, thyroid, liver disease, insulin resistance, age, and medications affect SHBG.
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