Utility of dilation and curettage in the diagnosis of pregnancy of unknown location

OBJECTIVE: We sought to determine utility of uterine evacuation for diagnosis of nonviable pregnancy of unknown location (PUL). STUDY DESIGN: We conducted a cohort study to assess the prevalence of ectopic pregnancy (EP), overall, and stratified by presenting signs and symptoms in women with a nonviable PUL. RESULTS: Of the 173 women, 66 (38%) had miscarriage (spontaneous abortion [SAB]) and 107 (62%) had EP. When initial human chorionic gonadotropin (hCG) was < 2000 mIU/mL, the odds of an EP were greater (odds ratio, 4.32; 95% confidence interval, 2.04-9.12). Demographic factors, obstetric history, and clinical presentation were not useful in distinguishing between EP and SAB. Pre-evacuation hCG increase had strong trend association with EP (odds ratio, 2.14; 95% confidence interval, 0.98-4.68). A > 30% fall in postcurettage hCG was suggestive, but was not a diagnostic indicator of SAB. CONCLUSION: Uterine evacuation is a useful diagnostic aid for women with nonviable PUL. Nondiagnostic ultrasound findings and absolute and serial hCG values are associated with, but do not accurately predict final diagnosis.