Majority of gestational trophoblastic neoplasia (GTN) follows molar pregnancies where diagnosis is mostly based on persistent or rising serum human chorionic gonadotrophin (hCG). Diagnosis of GTN could be based on clinical presentation, serum hCG measurement, imaging, histology, and genotyping. A high index of suspicion in women of reproductive age presenting with abnormal vaginal bleeding or unusual systematic presentation is important. An accurate staging and classification system for GTN is crucial to evaluate the risk and the prognosis of patients, and to optimize treatment. GTN is staged using the International Federation of Gynecology and Obstetrics 2000 staging and the modified World Health Organization prognostic scoring system.