Testosterone

What To Think About

• Most of the testosterone in the blood is bound to a protein called sex hormone binding globulin (SHBG). "Free" testosterone may be checked when conditions that can increase SHBG levels, such as obesity or hyperthyroidism, are present.
• The levels of other hormones made by the pituitary gland, such as follicle-stimulating hormone (FSH) and luteinizing hormone (LH), may be checked to see whether a low testosterone level is caused by problems with the testicles or ovaries or the pituitary gland. For more information, see the medical tests Luteinizing Hormone and Follicle-Stimulating Hormone. A really high level of LH and a low level of testosterone often means that the testicles or ovaries are not working properly. A low LH level and a really low or high testosterone level may mean a problem with the pituitary gland.
• For women, medicines such as birth control pills or corticosteroids may lower levels of testosterone. Oral estrogens used for hormone replacement therapy can also lower testosterone levels.

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Author:	Bets Davis, MFA	Last Updated: May 29, 2008
Medical Review:	Martin Gabica, MD - Family Medicine David C.W. Lau, MD, PhD, FRCPC - Endocrinology & Metabolism
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