Testosterone, % Free+Weakly Bound details
What Testosterone, % Free+Weakly Bound shows
In the blood, most testosterone is tightly bound to sex hormone-binding globulin (SHBG), while the rest is either free or loosely bound to albumin. This measurement gives the share of total testosterone in that free and weakly bound form, which is the part most available to your tissues. It is used together with total testosterone to calculate bioavailable testosterone. A higher percentage usually reflects lower SHBG, and a lower percentage usually reflects higher SHBG, which is affected by things like age, thyroid function, liver health and hormones. It is interpreted alongside total and bioavailable testosterone, not on its own.
Tests that include Testosterone, % Free+Weakly Bound
Testosterone, Bioavailable (Total, Free, Bioavailable, SHBG) offers a full evaluation of testosterone status. It measures total and free testosterone, as well as the portion that is loosely bound to albumin (bioavailable), alongside SHBG, to determine the amount of testosterone readily available for the body to use.
- Bioavailable Testosterone The portion of your testosterone that's either free or loosely bound to albumin — the amount actually usable by your body's tissues.
- Testosterone The primary male sex hormone, also present in women in smaller amounts. Evaluated for low testosterone symptoms, fertility, and reproductive hormone imbalances.
- Testosterone, % Free+Weakly Bound The percentage of total testosterone that is free or loosely bound to albumin, used to work out bioavailable testosterone.
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