Bioavailable Testosterone
also known as Bio T
NORMAL_RANGE
131 – 682 ng/dL
UNIT
ng/dL
/WHAT_IT_IS
Bioavailable testosterone is the sum of free testosterone plus albumin-bound testosterone — i.e., the portion that's actually accessible to tissues. It's a useful middle-ground marker between total and free T.
/NORMAL_RANGE
Reference: roughly 131–682 ng/dL for adult males. Calculated from total T, SHBG, and albumin.
What does high Bio T mean?
- +Same drivers as high free T — TRT, low SHBG, AAS use.
What does low Bio T mean?
- +Same drivers as low free T — low total T, high SHBG, calorie deficit.
/ON_TRT
Bioavailable T is less commonly tracked than free T but tells you the same story. If your lab reports it, the upper third of the range usually correlates with good symptomatic response on TRT.
/RELATED
/TRACK_THIS
Track Bio T in the app.
Upload your lab PDF — MyTRT extracts every marker with Gemini Vision. Charts, trends, and TRT-aware insights. Free on iOS and Android.