Scope & Definitions

• The NICE guideline NG126 covers diagnosis and initial management in women ≤ 13 completed weeks with pain or bleeding in early pregnancy. NICE

• It replaces CG154 (2012). NICE

• RCOG Green-top Guideline No. 21 addresses ectopic pregnancy diagnosis & management in detail. Royal College of Obstetricians+1

• Also relevant: NICE / ACOG on early pregnancy loss (miscarriage) management. ACOG+1

Clinical presentation & initial assessment

History & risk factors

• Common symptoms: vaginal bleeding, abdominal / pelvic pain (often between 6–10 weeks) PMC+1

• Atypical presentations are possible (e.g. gastrointestinal symptoms, syncope). Clinicians must maintain suspicion in women of reproductive age with pain or bleeding. PMC+2NICE+2

• Risk factors for ectopic pregnancy: prior tubal surgery, pelvic inflammatory disease, tubal damage, previous ectopic, ART/IVF, smoking, age > 35, prior pelvic/abdominal surgery.

• Physical examination & vital signs

• Assess hemodynamic stability: pulse, blood pressure, signs of shock/haemorrhage.

• Abdominal tenderness, peritoneal signs.

• Speculum/vaginal exam: bleeding source, cervical motion tenderness, adnexal tenderness or mass (but gentle – avoid provoking bleed).

• Beware that some ectopics present with minimal signs; absence of classic signs does not exclude ectopic. 

Diagnostic investigations

Serum ß-hCG & other biomarkers

• A single ß-hCG at presentation is essential. Serial ß-hCG (e.g. 48-hour repeat) helps in distinguishing viability / rise patterns, especially in pregnancies of unknown location (PUL). 

• Serum progesterone is not recommended for diagnosing ectopic (poor discriminatory power) in routine practice. 

Ultrasound

• Transvaginal ultrasound (TVS) is the imaging modality of choice. 

• If TVS is inconclusive, can supplement with transabdominal.

• Key sonographic findings favoring ectopic:
  • Empty uterine cavity (no gestational sac) 
  • Adnexal mass / sac (separate from ovary) / “ring sign” / gestational sac with yolk sac / fetal pole outside uterus 
  • Free fluid in the pouch of Douglas (suggestive of bleeding) 

• Other rarer ectopic types (cervical, caesarean scar, interstitial) have specific ultrasound criteria (e.g. interstitial line sign, myometrial thickness < 5 mm) TJO Istanbul+1

• MRI may be adjunct if ultrasound equivocal and local expertise available. TJO Istanbul+1

Pregnancy of unknown location (PUL) algorithm

• If neither IUP nor ectopic is visualized → label as PUL → follow with serial ß-hCG + repeat ultrasound until final diagnosis (viable IUP, failed PUL, or ectopic). TJO Istanbul+3PMC+3NICE+3

• A PUL must be managed until definitive outcome – cannot prematurely treat as miscarriage without excluding ectopic. NICE+2ACOG+2

Distinguishing miscarriage (early pregnancy loss)

• In confirmed intrauterine pregnancy, absence of fetal heartbeat or no growth on repeat scan suggests early pregnancy loss. ACOG+1

• Only when confidently excluded ectopic, can management of miscarriage proceed (expectant, medical, surgical) NICE+1

• Rh D prophylaxis: consider in miscarriage / early pregnancy loss (especially surgical) for Rh-negative women. ACOG+1

Initial management principles & decision-making

The goal is to choose the safest, least invasive option while preserving fertility, tailored to patient stability, size/viability of ectopic, and patient preferences.

When urgent surgical intervention is required

• Hemodynamic instability, signs of rupture or acute abdomen → immediate surgical management. 

• If massive intraperitoneal bleeding suspected or peritoneal signs → laparotomy if unstable, or laparoscopy if stable enough. 

• In surgery, options include salpingectomy or salpingostomy (conservative) depending on condition, contralateral tube, and surgeon expertise. 

Medical management (methotrexate)

• Indications: stable patient, no signs of rupture, small ectopic mass (often < 3 – 4 cm, no significant free fluid), low and declining or modestly rising ß-hCG (often < 5000 IU/L, though thresholds vary) 

• Contraindications include: hemodynamic instability, coexisting viable IUP (heterotopic), high ß-hCG beyond safe limit, significant pain, large mass, contraindications to MTX (renal, hepatic disease, immunodeficiency) 

• Regimens: single-dose methotrexate (with folinic acid rescue) is commonly used; some centers use multi-dose regimens.Monitor ß-hCG after treatment (e.g. day 4, day 7). A fall ≥ 15% between days 4 & 7 suggests treatment success; if not, may need additional dose or surgery. 

• Close follow-up with serial ß-hCG until undetectable. 

Expectant (conservative) management

• Consider in selected patients with low, falling ß-hCG levels and minimal symptoms, and in whom spontaneous resolution is likely.

• Requires rigorous follow-up (ß-hCG, repeat ultrasound).

• Not appropriate if rising ß-hCG or risk of rupture.

Miscarriage (early pregnancy loss) management

Once ectopic is excluded:

• Options: expectant, medical, or surgical evacuation. ACOG+1

• Medical: Misoprostol (800 µg vaginal) is standard; adding mifepristone (200 mg) 24h before misoprostol improves efficacy. ACOG

• Surgical: Vacuum aspiration / suction curettage as needed (e.g. heavy bleeding, incomplete loss). Use prophylactic antibiotics (doxycycline) and Rh immunoglobulin in Rh-negative women if surgical. ACOG+1

• Expectant: In asymptomatic women with low risk of complications; monitor until complete expulsion.

• Rh D prophylaxis: in miscarriage / surgical management in Rh-negative women (especially >6–12 weeks). ACOG+1

Follow-up, counseling & future pregnancies

• Counsel patient regarding future fertility, risk of recurrence, timing of next pregnancy.

• In next pregnancy, early ultrasound (first trimester) to confirm intrauterine location.

• Psychological support, grief counseling as early pregnancy loss / ectopic has emotional impact.

• Ensure adequate follow-up for ß-hCG to zero in ectopic cases.

• Document and review risk factors to counsel and possibly modify (e.g. smoking cessation).

Recommended management (per RCOG / NICE):

• If the patient is clinically stable, and the scan shows no intrauterine or ectopic mass,
  → Repeat serum hCG in 48 hours and reassess.

• Expected pattern:

  • Normal intrauterine pregnancy: hCG rises by ≥63% in 48 hours.

  • Failing pregnancy: hCG falls by ≥50%.

  • Ectopic pregnancy: hCG rise is suboptimal or plateauing.

Summary algorithm (simplified)

1. Woman presents with bleeding ± pain in early pregnancy ➝

2. Check vital signs → If unstable, manage as surgical emergency.

3. Draw ß-hCG, do transvaginal ultrasound.

   • If IUP confirmed → proceed to evaluate for viability / miscarriage.

   • If ectopic visualized → decide between surgery / methotrexate / expectant.

   • If PUL → serial ß-hCG + repeat ultrasound until final status determined.

4. Once ectopic excluded and intrauterine nonviable pregnancy, manage miscarriage (expectant / medical / surgical) with Rh prophylaxis as needed.

Miscarriage – Key Points

🔹 Definitions

• Miscarriage: Pregnancy loss before 24 weeks (usually <20 weeks for RCOG context).

• Threatened: Bleeding, closed os, live fetus.

• Inevitable: Open os, ongoing bleeding.

• Incomplete: Some products passed.

• Complete: All products expelled, empty uterus.

• Missed: Retained non-viable pregnancy, no bleeding.

🔹 Diagnosis

• Transvaginal ultrasound is gold standard.

  • Crown–rump length (CRL) ≥7 mm with no heartbeat = miscarriage.

  • Mean gestational sac ≥25 mm with no embryo = miscarriage.

  • If uncertain, repeat scan after 7–10 days.

🔹 Management Options

1. Expectant management

• Suitable if <13 weeks and clinically stable.

• 70–80% success within 2 weeks.

2. Medical management

• Mifepristone 200 mg orally, then Misoprostol 800 µg vaginally after 24 hours.

  • Effective in 80–90%.

  • Can repeat misoprostol if incomplete.

3. Surgical management

• Manual vacuum aspiration (MVA) or suction curettage.

• Indications:

  • Heavy bleeding, infection, or patient preference.

  • Failed expectant/medical management.

🔹 Rh prophylaxis

• Rh-negative women: give Anti-D 250 IU if

  • Surgical or medical evacuation

  • Ectopic pregnancy

  • ≥12 weeks bleeding

  • Threatened miscarriage after 12 weeks

🔹 Post-miscarriage care

• Provide written information and emotional support.

• Offer follow-up ultrasound if symptoms persist.

• Refer for recurrent miscarriage if ≥3 consecutive losses.

🧠 MRCOG Exam Tips

• Know criteria for expectant vs methotrexate vs surgery in ectopic.

• hCG thresholds and trends are frequent SBA themes.

• For miscarriage: recall ultrasound criteria and Anti-D indications.

• In TOACS: focus on counselling, safety-netting, and emotional support.

• Always mention early scan in next pregnancy.