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Ectopic pregnancy — USMLE Step 3 MCQ

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ModerateOB/GYN (prenatal care, contraception, screening)Ectopic pregnancyUSMLE Step 3

A 28-year-old woman has 6 weeks of amenorrhea, lower abdominal pain, and light vaginal bleeding. She is hemodynamically stable. Urine pregnancy test is positive. Transvaginal ultrasound shows no intrauterine pregnancy and a right adnexal mass. Serum beta-hCG is 2200 mIU/mL. Which of the following is the most likely diagnosis?

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Correct answer: A — Ectopic pregnancy

Pregnancy with pain, bleeding, beta-hCG near discriminatory range, no intrauterine pregnancy, and adnexal mass indicates ectopic pregnancy.

Reference: ACOG Ectopic Pregnancy Practice Bulletin