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Finding-the-Path: Case 12

History

A 30-year-old woman presents to the emergency room with abdominal cramping and vaginal bleeding. Her last menstrual period was 7 weeks ago. Physical examination reveals a palpable left adnexal mass. She has a positive pregnancy test with beta-HCG (human chorionic gonadotropin) of 14,000 IU/L.

Which study do you request first?