Testosterone (Free) Direct Test
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About Our Testosterone (Free) Direct Test
Note: Fasting is not required for this test.
This blood test measures levels of testosterone, a human sex hormone, for overproduction or deficiency. The Free (Direct) Testosterone test measures the amount of free testosterone in the blood (which includes albumin-bound testosterone since it can easily convert to free testosterone).
Testosterone testing is used to evaluate androgen excess or deficiency related to gonadal function, adrenal function, or tumor activity. Testosterone levels may be helpful in men for the diagnosis of hypogonadism, hypopituitarism, Klinefelter syndrome, and impotence (low values). This test is helpful in assessing testicular function in males.
Testosterone levels may be requested in women to investigate the cause of hirsutism, anovulation, amenorrhea, virilization, masculinizing tumors of the ovary, tumors of the adrenal cortices, and congenital adrenal hyperplasia (high values).
Reduced levels of testosterone in men can lead to:
- Decrease in libido/sex drive
- Erectile dysfunction
- Decreased muscle tone
- Increase in body fat/enlarged breasts
Women should consider testosterone testing if:
- They are concerned about infertility
- Have thinning scalp hair
- Have heavy vaginal bleeding
- Experience low libido
- Have menopausal women
- Irregular or missed periods
- Have unusual bouts of acne or facial/body hair growth