This test is often used as a routine test for reproductive tract infections in women during pregnancy. 1.Toxoplasma gondii infection Toxoplasma gondii infection is a zoonotic disease, and cats and other animals are the source of infection. Acquired infection is often asymptomatic in light cases, but antibodies can be detected in the serum; heavy cases can cause various symptoms, such as high fever, muscle or joint pain, swollen lymph nodes, etc. Intrauterine infection through the placenta can cause stillbirth and premature birth, and after birth can show a series of central nervous system symptoms and congenital damage to the eyes and internal organs. 2, rubella virus pregnant women infected with rubella mostly in the first to sixth weeks of pregnancy, in addition to miscarriage, death, the baby born can also occur congenital rubella syndrome. lgM antibody positive suggests a recent infection, if necessary, should be terminated. 3, cytomegalovirus lgM antibody Positive indicates that the patient has a recent cytomegalovirus infection, but should be analyzed in the context of the clinical situation. 4.Herpes simplex virus mainly causes herpes stomatitis, eczematous herpes, herpes keratoconjunctivitis, neonatal herpes, herpes vulvovaginitis, etc. Infections outside the reproductive organs are mostly caused by herpes simplex virus – type I, while infections of the reproductive organs are mostly caused by herpes simplex virus – type II. This test cannot distinguish between herpes simplex virus- type I or herpes simplex virus- type II. lgM antibody positivity suggests recent herpes simplex virus infection.