Post Testosterone to Testosterone Free

Testosterone free is calculated from the 3 tests Testosterone, SHBG and Albumin.
If testosterone has already been performed on your lab report, we can provide the post-determination of within 5 business days of receiving the blood at our lab:

• SHBG
• Albumin

You do not then need to have blood drawn again. You will receive the calculation of Testosterone Free from these values.

Testosterone is the most important male sex hormone. Testosterone is needed for normal development of the male sex characteristics. In addition, testosterone is needed for proper sperm production.

Most of the testosterone is bound to the transport protein SHBG (Sex Hormone Binding Globulin) and is therefore not biologically active. This test measures the amount of unbound, biologically active testosterone.

The test measures the amount of Sex Hormone Binding Globulin (SHBG) in blood. SHBG is a protein (globulin) that is produced by the liver and is able to strongly bind testosterone and estradiol. SHBG then transports these hormones in an inactive form through the blood throughout the body. Testosterone inhibits the production of SHBG while estradiol stimulates it.

Men mainly produce testosterone in the testes and very little estradiol. Women produce mostly estradiol in the ovaries (ovaries) and a little testosterone in ovaries and in the adrenal gland. Change in the amount of SHBG affects the amount of testosterone that is freely available.

Click here for the Free Testosterone Calculator