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 LIBRARY
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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.
Female cycle-phase detail is on the next section. LC-MS/MS is preferred at low concentrations.
Female phase detail is on the next section. Exogenous progesterone route/timing matters.
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.
Female follicular <80; luteal <285; postmeno <51. Morning timing and stimulation testing may be needed.
Method and units vary. Define clinical use before adopting a clinic target.
Assay-specific, especially at low concentrations.
No broadly accepted wellness target. Use exact assay and clinical indication.
Lab-specific. Interpret with symptoms, medication effects, and differential.
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