The main purpose of the marriage test is to check for hereditary diseases, the basic condition of the body and the condition of the reproductive system, and to determine whether there are any diseases that affect fertility. The marriage test first asks the man and woman if they have a family history of genetic diseases, mental illnesses, and if they have any hereditary diseases themselves. The individual’s life history and the woman’s menstrual history are asked. It will also check the basic health status of the man and woman, such as a full body physical examination, as well as blood routine, urine routine, liver function, kidney function, chest X-ray, electrocardiogram and so on. The marriage test also examines the reproductive systems of both men and women, with men checking the condition of the testicles, bladder, and prostate, as well as conducting laboratory tests on semen. Women are examined for vulva, vagina and uterus, and vaginal secretions are checked. It is recommended that men and women undergo a premarital examination before marriage, which plays a very important role in eugenics.