Hormones
What is Free (bioactive) testosterone?
the active part of your testosterone
- Unit
- pmol/L
- Sample
- Serum
- Fasting
- No fasting needed
- Turnaround
- 3 days
Bioactive testosterone is the free and loosely bound fraction - the part that actually affects body tissues.
The value matters when investigating low testosterone because total testosterone can be normal even when bioactive testosterone is low, especially when SHBG is raised.
What does low Free (bioactive) testosterone mean?
Low bioactive testosterone suggests functional androgen deficiency and can cause symptoms even when total testosterone looks normal.
What does high Free (bioactive) testosterone mean?
High values are read in the context of total testosterone and SHBG.
Panels that measure Free (bioactive) testosterone
- Male Hormone Test Base
- Male Hormone Test Plus
- Male Hormone Test Complete
- Health Check Man
Reading
More markers in the same area
Launching in Stockholm in 2026.
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This is general information about the marker, not an assessment of your values and not medical advice. Last updated: August 2026.