Testosterone

What Affects the Test

Reasons you may not be able to have the test or why the results may not be helpful include:

• Taking medicines such as estrogen (including birth control pills), testosterone, corticosteroids, digoxin (Lanoxin), spironolactone (Aldactone), or barbiturates.
• Having hyperthyroidism. This can raise sex hormone binding globulin (SHBG) levels. Hypothyroidism can lower SHBG levels.
• Taking medicines to treat prostate cancer.
• Taking medicines that raise prolactin levels, such as certain seizure medicines.

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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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