Direct measurement of free testosterone

The Free Testosterone blood test directly measures the amount of free testosterone in the blood. Free testosterone is the small portion of total testosterone that is not bound to transport proteins such as SHBG and albumin and is therefore immediately available to the body.

This test can provide additional information about testosterone status, for example, when total testosterone levels do not align well with the clinical picture or when abnormal SHBG levels are suspected.

What is measured?

This blood test measures free testosterone directly in the blood. The value is therefore not calculated based on total testosterone, SHBG, and albumin, as is the case with calculated free testosterone according to the ISSAM method.

When might this test be useful?

A free testosterone test can be used, among other things, to gain a better understanding of the amount of biologically available testosterone, as a supplement to a total testosterone test.

Please note: The results and reference ranges depend on the laboratory method used. Always discuss abnormal results or health concerns with a doctor.