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Testosterone

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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), Dihydrotestosterone (DHT), Gonadotropin-releasing Hormone, Semen Analysis, Anti-Mullerian Hormone, Androstenedione

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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 or the inability of your partner to get pregnant (infertility); in females, to help diagnose the cause of masculine physical features (virilization), infertility, or polycystic ovary syndrome (PCOS); in children, to help determine the cause of genitals that are not clearly male or female (ambiguous genitalia) or delayed or early puberty

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; a morning sample is preferred.

Test Preparation Needed?

None