Definition:
Testosterone is the main male hormone, produced in the testes, which stimulates the development of male sex characteristics (like body hair and muscle growth) and is essential in the production of sperm. Low levels of testosterone can cause male infertility.
Testosterone is also produced in smaller amounts by the ovaries in women. Unusually high levels of testosterone in women may be a sign of PCOS.
Testosterone levels may be tested as part of an infertility work-up in men and women.
