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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 24-year-old woman has lower abdominal pain and vaginal bleeding. Last menstrual period was 7 weeks ago. Blood pressure is 104/68 mm Hg. Serum beta-hCG is 2100 mIU/mL. Transvaginal ultrasonography shows no intrauterine pregnancy and a right adnexal mass. Which of the following is the most likely diagnosis?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: B — Ectopic pregnancy

Positive pregnancy test with adnexal mass and no intrauterine pregnancy at a discriminatory beta-hCG level suggests ectopic pregnancy.

Reference: ACOG ectopic pregnancy guidance; USMLE Step 3 Content Outline