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Estimating the Free Testosterone Level Using the Free Androgen Index (FAI)

Specialty:

Nephrology, Urology, Obstetrics & Gynecology, Pedatrics, Genetics

Objective:

ICD-10:

Description:

Prior to the current availability of tests for measuring free testosterone, Carter et al used the ratio of total testosterone to sex hormone binding globulin (SHBG) to estimate the amount of bioavailable testosterone. This was termed the Free Androgen Index (FAI), but it also has been referred to as the Androgen Index (AI). It can be useful in evaluating hirsute women or if the free testosterone level is not available.

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