Ectopic pregnancy vs Threatened miscarriage
How to tell Ectopic pregnancy and Threatened miscarriage apart when a board question makes them look alike.
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No intrauterine pregnancy on transvaginal ultrasound above discriminatory beta-hCG level indicates ectopic pregnancy until proven otherwise.
Side by side
First-trimester pain and bleeding with no intrauterine pregnancy visualized above discriminatory beta-hCG level suggests ectopic pregnancy.
First-trimester bleeding with closed cervix and a confirmed viable intrauterine pregnancy suggests threatened miscarriage.
Implantation outside the uterine cavity, most commonly tubal, causes abnormal trophoblastic growth and rupture risk.
Intrauterine gestation remains implanted but bleeding occurs from partial decidual separation without expulsion.
Transvaginal ultrasound without intrauterine gestation when beta-hCG is above about 1500 to 3500 mIU/mL raises ectopic concern; serial beta-hCG rise is suboptimal.
Threatened miscarriage shows intrauterine gestational sac with fetal cardiac activity and closed cervix, with beta-hCG trend often appropriately increasing.
The trap
Any early bleeding with a positive pregnancy test is called threatened miscarriage before ultrasound correlation. Missing ectopic diagnosis risks tubal rupture and hemorrhagic shock.
The repair move
Next best step: if hemodynamically stable and criteria are met, treat ectopic pregnancy with methotrexate 50 mg/m2 IM and follow day-4/day-7 beta-hCG decline. If unstable or rupture signs are present, proceed to urgent surgical management. Threatened miscarriage with viable intrauterine pregnancy is managed expectantly with close follow-up.
Try a free question
CoreA 26-year-old pregnant patient has pelvic pain and spotting at 6 weeks. Beta-hCG is 3200 mIU/mL and transvaginal ultrasound shows no intrauterine pregnancy. What is the next best step in management?
Show answer and explanation
Answer: A. Treat as probable ectopic pregnancy and initiate appropriate ectopic pathway. Absence of intrauterine pregnancy above discriminatory hCG level mandates ectopic-focused management.
Why the other choices are tempting
- B. Wrong. Threatened miscarriage requires confirmed intrauterine pregnancy.
- C. Wrong. Delay may allow rupture.
- D. Wrong. Progesterone does not exclude or treat ectopic gestation.
- E. Wrong. Misoprostol targets uterine pregnancy loss and is not first-line ectopic care.
Flashcards
Tap a card to flip it.
What ultrasound and beta-hCG combination strongly suggests ectopic pregnancy?
No intrauterine pregnancy despite beta-hCG above discriminatory range.
Which cervical exam finding is typical in threatened miscarriage?
Closed cervical os.
Quick answers
What is the fastest way to tell Ectopic pregnancy from Threatened miscarriage?
No intrauterine pregnancy on transvaginal ultrasound above discriminatory beta-hCG level indicates ectopic pregnancy until proven otherwise.
What is the key clue for Ectopic pregnancy?
First-trimester pain and bleeding with no intrauterine pregnancy visualized above discriminatory beta-hCG level suggests ectopic pregnancy.
What is the key clue for Threatened miscarriage?
First-trimester bleeding with closed cervix and a confirmed viable intrauterine pregnancy suggests threatened miscarriage.
What is the common trap with Ectopic pregnancy vs Threatened miscarriage?
Any early bleeding with a positive pregnancy test is called threatened miscarriage before ultrasound correlation. Missing ectopic diagnosis risks tubal rupture and hemorrhagic shock.