The male chromosome test is mainly a peripheral blood cell male chromosome karyotype analysis, including checking the structure and number of chromosomes, which is aimed at checking whether there are any defects in the male chromosomes and whether the male is infertile. Under normal circumstances, the karyotype of male chromosomes is 46XY, i.e., with 44 regular chromosomes, one X sex chromosome and one Y sex chromosome, then the karyotype of the spermatozoon will be 23X or 23Y. If the chromosomes are defective, then no sperm can be formed or no normal sperm can be formed, which will lead to infertility of the male. Chromosome test can also check whether a man suffers from certain chromosomal diseases, or whether his body carries the chromosomes of certain abnormal diseases, and since there is no particularly effective treatment for diseases caused by chromosomal abnormalities, a test before pregnancy can be a good way to avoid chromosomal diseases in the fetus. If the male partner has repeated miscarriages, stillbirths, malformations and other bad pregnancies, he or she should go to the hospital for a timely examination.