Bioavailable T
Testosterone that is either free or loosely bound to albumin — the portion available to tissue.
What is it
Bioavailable testosterone includes free testosterone plus testosterone loosely bound to albumin. It represents the testosterone available to interact with tissues.
Why it's measured
Bioavailable testosterone has been used in research as an alternative to free testosterone for evaluating androgen status.
Reference range
Standard laboratory reference
Men: 130 – 680 / Women: 0.8 – 10 ng/dL
Reference ranges vary by laboratory. Your individual reference range will appear on your test report and should be interpreted by your physician in the context of your overall health profile.
What results may indicate
Elevated
Warrants clinical evaluation, particularly in women.
Lower
Has been associated with low androgen-related symptoms in research literature.
These associations are general. They are not a personal diagnosis or prediction. Discuss your individual results with your physician in the context of your full health profile.
When it's measured
Calculated when total testosterone, SHBG, and albumin are measured together.
Related markers
Common questions
Bioavailable testosterone includes free testosterone plus testosterone loosely bound to albumin. It represents the testosterone available to interact with tissues.
It's one of the markers used to build a fuller picture of your health. On its own it tells you very little, so it's most informative when reviewed alongside related markers.
It's measured from a standard blood draw at Quest or LabCorp. Bioavailable Testosterone is one of the markers included in the OPTML Apex Panel, where your results are read across systems and reviewed by a U.S.-licensed physician.
Reference ranges vary by laboratory, and a single value rarely tells the whole story. Review your result with a physician in the context of your other markers, symptoms, and history.
Bioavailable Testosterone is one signal among many. Answer a few quick questions and we’ll point you to the panel that fits.
Measured in
A complete look at your heart, hormones, metabolism, inflammation, and longevity systems — drawn at Quest or LabCorp, reviewed by a U.S.-licensed physician.
Explore the Apex Panel →This information is for general educational purposes only and is not medical advice. Lab results alone are not intended to diagnose, treat, or cure any condition and do not replace the advice of a healthcare provider. OPTML does not offer medical advice, a diagnosis, medical treatment, or any form of medical opinion.