A semen analysis is used to determine whether a man might be infertile—unable to get a woman pregnant. The semen analysis consists of a series of tests that evaluate the quality and quantity of the sperm as well as the semen, the fluid that contains them. The test may be used, in conjunction with other infertility tests, to help determine the cause of a couple's inability to get pregnant (conceive) and to help guide decisions about infertility treatment.