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About Our Testosterone Free and Total Test
Note: Fasting is not required for this test.
Testosterone testing is used to diagnose several conditions in both men and women, as well as detecting low levels or deficiencies in men. Testosterone is the main sex hormone in men and is responsible for male physical characteristics. Typically testosterone is considered to be a male sex hormone, but it is present in the blood of females as well.
This testosterone blood test measures the total amount of testosterone that is bound to proteins in the blood as well as testosterone that is not bound (free testosterone). Approximately two-thirds of testosterone circulates in the blood bound to SHBG and less than one-third is bound to albumin. A small percent (less than 4 percent) circulates in the blood as free testosterone.
Testosterone testing may be used to help evaluate the following conditions:
- Decreased sex drive/libido in men and women
- Erectile dysfunction in men
- Infertility in men and women
- Testicular tumors in men
- Hypothalamus or pituitary gland disorders
- Hirsutism and/or virilization in women