The fraction of circulating testosterone not bound to sex hormone-binding globulin (SHBG) or albumin. Free testosterone is the biologically active portion and is often measured when total testosterone is borderline or SHBG is abnormal.
The fraction of circulating testosterone not bound to sex hormone-binding globulin (SHBG) or albumin. Free testosterone is the biologically active portion and is often measured when total testosterone is borderline or SHBG is abnormal.