Gestational trophoblastic disease is considered low risk if it is one of the following: FIGO stage I (persistently elevated beta-hCG level and / or tumor confined to the uterus) FIGO stage II or III with a WHO risk score of ≤ 6 Gestational trophoblastic disease is considered high risk if it is one of the following: FIGO stages II and III with a WHO risk score of > 6 FIGO stage IV After remission of gestational trophoblastic neoplasia (normalization of hCG levels), hCG levels should be measured at 2-week intervals during the first 3 months, then at monthly intervals for at least 12 months.