A semen analysis, also called a sperm count, measures the quantity and quality of a man's

semen and sperm. Semen is the thick, white fluid released from the penis during a man's

sexual climax (orgasm). This release is called ejaculation. Semen contains sperm, the cells in

a man that carry genetic material. When a sperm cell unites with an egg from a woman, it

forms an embryo (the first stage of an unborn baby's development).A low sperm count or

abnormal sperm shape or movement can make it difficult for a man to make a woman

pregnant. The inability to conceive a baby is called infertility. Infertility can affect men

and women. For about one-third of couples unable to have children, male infertility is the

reason. A semen analysis can help figure out the cause of male infertility.