Generally sperm test is used for preconception checkups or if the man himself has unexplained symptoms of infertility. Meanwhile, if a woman has frequent miscarriages and birth defects after pregnancy, a sperm test is also needed. 1. Pre-conception examination: In the pre-conception examination, it is usually necessary to conduct a comprehensive test on the quality of sperm and eggs of both men and women, and assess the fertility of both parties, which can help reduce the possibility of congenital genetic diseases and teratomas after pregnancy. 2. Infertility: When men experience infertility symptoms and the cause cannot be identified for the time being, it is also recommended to undergo a sperm test, which can effectively determine the specific cause of infertility by observing the sperm count, sperm viability, and so on. 3. Abnormal female pregnancy: When women have frequent miscarriages, stillbirths or deformed fetuses after pregnancy, it is also necessary to conduct targeted testing of male sperm to determine whether there are chromosomal abnormalities or developmental abnormalities in male sperm. When a man has a pathologic disease or needs to get pregnant, sperm testing should be performed in a timely manner to avoid the emergence of serious hereditary diseases or adverse symptoms.