The pregnancy test for infectious diseases is a screening test for infectious diseases, including hepatitis B, hepatitis C, syphilis and AIDS, which can be transmitted vertically from mother to child. The pregnancy test for infectious diseases is usually done twice, depending on the patient’s condition. The first check is when the pregnancy is filed, in order to prevent vertical transmission from mother to child, if abnormalities are detected, treatment is needed to reduce the probability of diseases caused by vertical transmission from mother to child after the birth of the newborn, resulting in a poor prognosis. The second check for the pregnancy week for 36-37 weeks, is in order to prepare for the upcoming delivery, because the delivery process may have blood transfusion, etc., so the results of infectious diseases need to be dealt with accordingly, so the pregnancy test for infectious diseases generally need to be examined two times. Pregnancy test for infectious diseases should be carried out under the guidance of a professional doctor, not because of the trouble and do not do the test. At the same time, if the pregnancy test for infectious diseases is abnormal, it may require more than 2 times of testing, the specific circumstances should be carried out under the guidance of a specialized doctor.