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Hormones · 02 / 30
Free testosterone
Measured or calculated
The part of testosterone that is not bound to carrier proteins.
What it measures
The part of testosterone that is not bound to carrier proteins.
Why it is used
Helps when total testosterone does not explain symptoms or when SHBG changes.
Interpretation note
The laboratory must specify whether it is measured directly or calculated.
Availability
Under validation. Inclusion in any offer depends on the partner laboratory's validation and the sample volume. It cannot be ordered yet.
Read together with
Proposed packages
- Hormone Balance · proposal, not yet on sale
Sources
Rythm Health's public “What we test” list (checked 15.10.2026) and the preliminary Tasso+ product study for Kosovo.