The TORCH test includes rubella virus, cytomegalovirus, toxoplasmosis and herpes simplex virus, which are pathogens that can cause congenital intrauterine infections and perinatal infections resulting in perinatal malformations, and are abbreviations for a group of pathogenic microorganisms, of which T is toxoplasmosis, R is rubella virus, C is cytomegalovirus and H is herpes simplex. If a pregnant woman is infected by any of these viruses, her own symptoms are mild or even asymptomatic, but they can be transmitted vertically to the fetus, resulting in intrauterine infection, causing severe signs and symptoms in the embryo and fetus, and even leading to miscarriage, stillbirth, or stillbirth, and even if she survives after birth, she may be left with serious congenital defects such as central nervous system disorders. The TORCH test includes both IgM and IgG antibodies, the former indicating a recent infection of 1 to 2 months and the latter indicating a previous infection, indicating a certain level of immunity, especially a positive IgG for rubella virus, which is considered to have lifelong immunity. The preconception TORCH test is to find out a woman’s immune status to these viruses, whether she needs to be vaccinated against rubella or whether she has some immunity to other viruses, so as to guide the preconception women on the timing of pregnancy and precautions to be taken for the purpose of eugenics. It is best to have a gynecological examination before pregnancy because some pathogenic microorganisms such as gonococcus, syphilis spirochetes, Chlamydia trachomatis, etc., can also cause intrauterine infection in the fetus and affect its normal development. If the above pathogenic microbial infections are found, conception should be delayed and aggressive treatment should be carried out. If you have mycosis or trichomoniasis before pregnancy, it is better to cure it before pregnancy. In addition, an ultrasound examination should be done before conception to understand the condition of the uterus and its adnexa. Pre-conception check-up is an essential part of eugenics, which not only can exclude the occurrence of some diseases in children, but also allows pregnant women to have a healthy baby with confirmation of their health, such as those suffering from certain hereditary diseases, metabolic diseases, medical complications and other diseases, are advised not to get pregnant in the first place. Pre-conception check-ups can also reveal the presence of viral infections, which, if contracted, can lead to intrauterine infection in the fetus. Therefore, preconception checkups are necessary and should not be ignored.