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This test measures the level of testosterone in the blood. Testosterone is the main sex hormone (androgen) in men. It is responsible for male physical characteristics. Although it is considered to be a “male” sex hormone, it is present in the blood of both men and women.
Early morning samples are preferred. A woman’s sample should be collected at specific times during her menstrual cycle. Inform the doctor if you are on any medications, have any allergies or underlying medical conditions before this test.
Testosterone is mainly produced by special endocrine tissue (the Leydig cells) in the male testicles. It is also produced by the adrenal glands in both males and females and, in small amounts, by the ovaries in females.