Free Testosterone – Free testosterone is the small fraction of testosterone not bound to proteins – the portion active in your tissues.
What Free Testosterone measures
Free Testosterone measures the biologically active testosterone available to your body, which can matter more than the total when symptoms don’t match the total value.
Typical ranges
Reported in pg/mL or as a percentage of total; labs provide sex- and age-specific ranges. Reference ranges differ between laboratories and by age and sex, so always read your result against the range printed on your own report.
What high results can mean
Can relate to supplementation or, in women, conditions like PCOS.
What low results can mean
Can explain low-testosterone symptoms even when total testosterone looks borderline.
How the test is done
A blood sample (often morning), sometimes calculated from total testosterone and SHBG. At-home collection works well for this marker when the sample is processed by a certified lab.
FAQ
What is a normal Free Testosterone level?
Reported in pg/mL or as a percentage of total; labs provide sex- and age-specific ranges. Your ideal target depends on your age, sex, and health history, so review results with a clinician.
What does a high Free Testosterone result mean?
Can relate to supplementation or, in women, conditions like PCOS.
Can I test Free Testosterone at home?
Yes. A blood sample (often morning), sometimes calculated from total testosterone and SHBG. An at-home sample processed by a certified lab gives reliable results.
This article is educational and not a substitute for medical advice. Discuss your results with a qualified clinician.