A positive IgM antibody test for cytomegalovirus after pregnancy means that there is a high probability of presenting cytomegalovirus infection, which may cause fetal malformation. However, whether this is the case is also determined in combination with cytomegalovirus IgG antibodies. If both antibodies are positive, it is likely that the infection is present, but it is not possible to tell whether it is a first infection or a previous infection, which can be further confirmed by the affinity index of the cytomegalovirus IgG antibody. If the IgG antibody is negative, the test can be repeated after a period of time. If the result of the review is positive, it means that the infection is a primary cytomegalovirus infection, which is very likely to cause fetal malformation. If the IgG antibody is still negative, the IgM antibody may be a false positive, which can be determined by clinical symptoms and the DNA quantification of cytomegalovirus. If it is the first infection, the possibility of causing fetal malformation is higher, and in most cases termination of pregnancy will be recommended, but this also depends on the wishes of the pregnant woman. It is also possible to continue to observe the fetus for any malformations.