Reevaluating the role of dilation and curettage in the diagnosis of pregnancy of unknown location

ObjectiveTo evaluate the clinical utility of dilation and curettage (D&C) in diagnosing ectopic pregnancy (EP).DesignRetrospective cohort study.SettingUniversity hospital.Patient(s)Clinically stable women (n = 321) who underwent a diagnostic D&C with no visible intrauterine pregnancy (IUP) on transvaginal ultrasound or those with an abnormal hCG trend.Intervention(s)None.Main Outcome Measure(s)EP or IUP made by final pathologic review.Result(s)Overall, 73.2% of the patients were ultimately diagnosed with EP and 26.8% were found to have a nonviable IUP. Those with EPs had significantly lower initial hCGs than those with nonviable IUPs and were more likely to have had a history of an EP. On ultrasound, the overall impression, the presence of free fluid, and the endometrial echo complex correlated well with the final diagnoses but did not have 100% predictive value.Conclusion(s)D&C remains valuable to differentiate EP from nonviable IUP and to avoid misdiagnosis and unnecessary exposure to methotrexate. Low initial hCG values and ultrasound findings such as a thin endometrial echo complex and the presence of free fluid are associated with but are not diagnostic of an ectopic pregnancy.