Semen analysis also known as a sperm count is a test to determine the number and quality of sperm in a man's semen. By seeing if the man is producing enough normal sperm capable of fertilizing an egg this test(in addition to other tests) can help investigate infertility. The most important things to look for in semen analysis are number and structure of the sperm, volume of semen, sperm movement, sperm resistance to flow and semen thickness, acidity and sugar content.
Attribution: Straight Talk Foundation