Ectopic Pregnancy
Direct answer
Ectopic pregnancy is implantation outside the uterine cavity — over 95% in the fallopian tube, most often in the ampullary region. It classically presents with amenorrhoea, pain and vaginal bleeding; diagnosis rests on transvaginal ultrasound with quantitative beta-hCG — an empty uterus with raised hCG beyond about 1500-2000 mIU/mL plus an adnexal mass or free fluid clinches it. Ruptured ectopic pregnancy is a surgical emergency and a leading cause of first-trimester maternal death.
What you must remember
- Site: tubal ectopics dominate, with the ampulla the commonest location (about 70%); the isthmus ruptures earliest, the interstitial portion latest but catastrophically.
- Risk factors: previous ectopic, tubal surgery or damage, pelvic inflammatory disease, assisted reproduction, smoking, and pregnancy with an intrauterine device in situ (pregnancy despite an IUCD is likelier to be ectopic).
- Diagnosis: transvaginal ultrasound with quantitative beta-hCG; the discriminatory zone is about 1500-2000 mIU/mL — an intrauterine sac should be visible on TVS beyond this level, so its absence with a raised hCG means ectopic or early failing pregnancy.
- Ultrasound signs: adnexal mass (echogenic ring, "ring of fire" on Doppler) with or without free fluid; a pseudosac in the uterus must not be mistaken for a gestational sac.
- Medical management: single-dose methotrexate 50 mg/m² intramuscularly for haemodynamically stable, unruptured, willing patients — classically with no foetal cardiac activity, beta-hCG below about 5000 mIU/mL, a small adnexal mass and reliable follow-up.
- Surgery: laparoscopy is standard — salpingectomy when the tube is damaged, salpingostomy to conserve the tube when the contralateral tube is absent or diseased; rupture with shock demands emergency surgery.
- Anti-D: give anti-D immunoglobulin to Rh-negative women.
Common confusion
Ectopic pregnancy masquerades as the other causes of early bleeding with pain — threatened miscarriage (bleeding precedes pain, uterus appropriate for dates) and a ruptured or haemorrhagic corpus luteum cyst — and the reliable discriminator is transvaginal ultrasound with hCG, never a single hCG value. The pseudosac of ectopic pregnancy (surrounded by a single decidual layer) must be distinguished from a true intrauterine gestational sac with its double decidual sac sign. An empty uterus does not exclude ectopic below the discriminatory zone; such patients get serial hCG and repeat scanning, not reassurance.
Exam-focused takeaway
NEET-PG tests ectopic pregnancy at three levels: facts (commonest site, leading first-trimester killer), interpretation (discriminatory zone, ultrasound findings, serial hCG behaviour) and decisions (methotrexate criteria versus laparoscopy, salpingectomy versus salpingostomy, anti-D in Rh-negative women). Image-based stems show an adnexal echogenic ring or haemoperitoneum on ultrasound. Next-best-step vignettes present a woman with pain and bleeding, answered by urine pregnancy test then transvaginal ultrasound with beta-hCG. Risk-factor stems follow the tubal-damage logic — anything that scars the tube raises risk.
Practise previous-year and exam-style ectopic pregnancy questions inside the PrepElephant app — topic-wise question banks, full-length mocks and revision tools that resurface flagged stems on a spaced schedule.
Frequently asked questions
What is the commonest site of ectopic pregnancy?
The ampulla of the fallopian tube; overall, over 95% of ectopics are tubal.
How is ectopic pregnancy diagnosed?
By transvaginal ultrasound with quantitative beta-hCG — the combination, not either test alone, settles the diagnosis.
What is the discriminatory zone?
The beta-hCG level (about 1500-2000 mIU/mL on transvaginal scanning) beyond which an intrauterine sac should be visible; absence signals ectopic or early pregnancy failure.
When is methotrexate used?
In a stable, unruptured patient without foetal cardiac activity, with low beta-hCG (classically below 5000 mIU/mL) and a small mass, able to return for follow-up; rupture and instability demand surgery.
Salpingectomy or salpingostomy?
Salpingectomy when the affected tube is damaged; salpingostomy to preserve fertility when the opposite tube is absent or diseased.
Why is ectopic pregnancy dangerous?
Tubal rupture causes massive intraperitoneal haemorrhage; it remains a leading cause of first-trimester maternal death when diagnosis is delayed.
Practise this in the PrepElephant app
Question banks, previous-year questions, mock tests and revision tools — for Ectopic Pregnancy and Obstetrics And Gynaecology. Free to start.