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SHBG is a protein that attaches to sex hormones in your blood. When the SHBG protein binds to sex hormones, your tissues can't use those hormones. Your tissues can only use free sex hormones that aren't attached to SHBG. The test is most often used to gather information about how testosterone is working in the body.
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Testosterone is known as a "male" sex hormone, but females have testosterone in smaller amounts. Testosterone causes body hair, muscle growth, and a deepened voice after puberty in males. It controls sex drive, maintains muscle mass, and helps make sperm. In females, testosterone is important for the growth of bones and muscles. A testosterone levels test may help diagnose early or delayed puberty.
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