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Also known as: Total Testosterone; Free Testosterone; Bioavailable Testosterone
Formal name: Testosterone
Related tests: FSH, LH, SHBG, DHEAS, Estradiol (see Estrogens), DHT, Gonadotropin-releasing Hormone, Semen Analysis, Anti-Mullerian Hormone, Androstenedione

At a Glance

Why Get Tested?

To detect an abnormal testosterone level in males and females; in males, to help diagnose the cause of erectile dysfunction, the inability of your partner to get pregnant (infertility), or premature or delayed puberty; in females, to help diagnose the cause of masculine physical features (virilization), infertility, or polycystic ovary syndrome (PCOS)

When to Get Tested?

For males, when you may be infertile or are unable to get or maintain an erection; when you are a boy with either early or delayed sexual maturity (puberty)
For females, when you have male traits, such as a low voice or excessive body hair (hirsutism), when you have abnormal uterine bleeding, do not menstruate (amenorrhea), or are infertile

Sample Required?

A blood sample drawn from a vein in your arm

Test Preparation Needed?