what is bioavailable testosterone
In more straight way: 1  Sex hormone-linked testosterone is amount linked with SHBG (sex hormone binding globulin) in blood. 2  Free testosterone is a amount in blood not linked a any kind of protein or other stuff. 3  Bioavailable testosterone is amount in blood is readily available for biological effect. Albumin and other proteins bind with little strength to it, so if it not really free in peripheral tissues this testosterona releases from proteins and exerts biological effect.