Free Testosterone
Free testosterone is the fraction not bound to proteins. It is the part available to tissues, so it reflects androgen action more closely.
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Normal ranges
Adults: 4.5–42 pg/mL.
Units: pg/mL
Causes of deviations
Low levels:
Hypogonadism, excess weight, chronic illness.
High levels:
Usually with androgen use, or hyperandrogenism in women.
When to see a doctor
If the value is outside the range, discuss it with your doctor.
Related biomarkers
Panels
Hormone panel
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