Testosterone, free — lab reference
Some search terms matchedMayo example age 20-24: M 5.25-20.7; F <0.13-1.08. Declines with age and is method-dependent.
THE PURSER WELLNESS ENCYCLOPEDIA
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What’s searchable?Mayo example age 20-24: M 5.25-20.7; F <0.13-1.08. Declines with age and is method-dependent.
Depends on total testosterone, SHBG, albumin, calculation, and assay.
Estrogen, thyroid, liver disease, insulin resistance, age, and medications affect SHBG.
Stress, sleep, nipple stimulation, medications, pregnancy, and macroprolactin matter.
M 18-30: 105-728; F 18-30: 83-377. Values decline substantially with age.
Assay-specific and age-dependent.
Methods and units vary. Ask why DHT was measured and whether a target is relevant to your health question.
Assay-specific, especially at low concentrations.
No broadly accepted wellness target. Ask your clinician to use exact assay and clinical indication.
Cycle day and exogenous progesterone timing matter.
Wide physiologic variation.
Exogenous hormone use changes interpretation.
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