Biomarker education
Free testosterone: What It Measures & Why People Track It
Also called: Free T
Free testosterone measures the unbound, biologically active portion of testosterone.
General biomarker education — not personalized medical advice. Learn more
Result on your report
IllustrativeFree testosterone
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Range: Low – High
LowReference intervalHigh
What it generally measures
This test estimates or measures testosterone not bound to carrier proteins, which can differ in relative amount from total testosterone.
Common units on reports: pg/mL
Why people track it over time
Free testosterone is typically reviewed together with total testosterone rather than by itself.
Changes over time do not by themselves establish a diagnosis. Learn more
Questions you might ask a healthcare professional
Questions to bring
IllustrativeAsk how free testosterone relates to your total testosterone result.
Ask which method the lab used, since free testosterone can be measured or calculated differently between labs.
Related markers
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