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Radiology, Vol 190, 797-802, Copyright © 1994 by Radiological Society of North America

ARTICLES

Emergency department screening for ectopic pregnancy: a prospective US study

BH Braffman, BG Coleman, P Ramchandani, PH Arger, CF Nodine, BJ Dinsmore, A Louie and SE Betsch
Department of Radiology, University of Pennsylvania Medical Center, Philadelphia 19104.

PURPOSE: To determine the effectiveness of pelvic sonography as a screening test for ectopic pregnancy. MATERIALS AND METHODS: Pelvic sonograms were prospectively analyzed in 1,427 consecutive patients with a serum level of the beta subunit of human chorionic gonadotropin of over 1,500 IU/L. RESULTS: Sonograms were diagnostic in 1,158 patients and indeterminate in 269. When indeterminate studies were considered falsely negative, the diagnostic accuracy was 81%. Twenty- four percent of patients with indeterminate studies were subsequently proved to have ectopic pregnancy. In ectopic pregnancy (n = 103), the most common finding was a complex adnexal mass (specificity = 92% [P < .001]). The sensitivity and specificity of screening sonography for ectopic pregnancy were 99% and 84%, respectively. CONCLUSION: Pelvic sonography is an effective screening test for ectopic pregnancy. Having a one in four chance of harboring an ectopic pregnancy, patients with indeterminate studies require close follow-up. The presence of a complex adnexal mass is a strong predictor of ectopic pregnancy.


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