Following HCG levels. After a woman has a D&C to remove a molar pregnancy, it is usually recommended that she go on a reliable method of birth control and avoid conceiving for a year. Serial measurements of the HCG level are done and are important to determine if the molar prenancy has been completely removed and then to make sure that there is not reocurrance, which is associated with a poorer outcome.
Clean hygine. Healthy habits may decreased the incidence.