PPD is also known as tuberculin test, and a positive skin test result may have an effect on having IVF. It also depends on the exact reason for a positive PPD. Positive PPD indicates that you may have been vaccinated with BCG or infected with TB. 1. BCG vaccination: BCG is a vaccine used to prevent tuberculosis. Those who have a positive PPD result due to BCG usually have hard nodules that are larger than 5 millimeters, but smaller than 15 millimeters. If this is the case, most of them will not affect the IVF. 2. Infected with tuberculosis: There has been a tuberculosis infection. It is also necessary to go to the hospital combined with sputum smear examination and X-ray examination to clarify whether there is active tuberculosis in the body at present. If there is active tuberculosis, it is not possible to do IVF for the time being. This is because patients with tuberculosis infection have poorer immunity themselves, and pregnancy will also affect the development of the fetus. Those who have a positive PPD skin test need to go to the hospital for further examination to clarify the cause of the positive skin test result. Those who are not affected can undergo IVF.