Suspected Ectopic Pregnancy
Positive pregnancy test + pelvic pain, vaginal bleeding, or risk factors
All Pathways
Obstetrics & GynecologyEmergency
Ectopic Pregnancy Management (ACOG 2018)
Ectopic Pregnancy Management (ACOG 2018): Suspected Ectopic Pregnancy → Initial Assessment → Hemodynamically Stable? → EMERGENT SURGERY → Rh Status Mana...
Pathway Overview
15 steps
Algorithm Steps
15 total
01Start 02Action Initial Assessment
Evaluate stability and obtain diagnostics
- Vital signs - assess for hemodynamic instability
- Abdominal exam - peritoneal signs?
- Pelvic exam - cervical motion tenderness, adnexal mass
- Quantitative β-hCG
- Transvaginal ultrasound (TVUS)
- Blood type and Rh, CBC
03Decision Hemodynamically Stable?
Signs of rupture or significant bleeding?
04Warning EMERGENT SURGERY
Suspected ruptured ectopic - immediate OR
- Large-bore IV access x2
- Type and crossmatch 2-4 units
- Fluid resuscitation
- Emergency laparoscopy or laparotomy
- Salpingectomy (usually preferred)
- Blood products as needed
05Action Rh Status Management
Administer RhIG if Rh-negative
- All Rh-negative patients should receive RhIG
- 50 mcg if <12 weeks
- 300 mcg if ≥12 weeks
- Administer within 72 hours of diagnosis/treatment
06Outcome Follow-Up & Counseling
Continued monitoring and future pregnancy planning
- Weekly β-hCG until undetectable
- Contraception for 3 months post-MTX
- Future ectopic risk: 10-15%
- Counsel on early ultrasound next pregnancy
- Emotional support and counseling
07Decision Transvaginal Ultrasound Findings
Identify pregnancy location
08Outcome IUP Confirmed
Intrauterine pregnancy visualized - manage appropriately
- Gestational sac with yolk sac or embryo in uterus
- Consider threatened abortion vs. other etiology
- Heterotopic pregnancy rare but possible with IVF
09Action Ectopic Pregnancy Confirmed
Extrauterine gestational sac or mass with pregnancy features
- Adnexal mass separate from ovary
- Extrauterine gestational sac with yolk sac/embryo
- Ring of fire sign on Doppler
- Empty uterus with β-hCG above discriminatory zone
10Decision Treatment Selection
Medical vs. Surgical management
11Decision Methotrexate Candidate?
Assess eligibility for medical management
- Hemodynamically stable
- Unruptured ectopic
- β-hCG <5000 mIU/mL (best outcomes)
- No fetal cardiac activity
- Mass <3.5 cm (better success)
- No contraindications to MTX
- Able to comply with follow-up
12Action Methotrexate Protocol
Single-dose preferred for most cases
- SINGLE DOSE: MTX 50mg/m² IM day 1
- Check β-hCG days 4 and 7
- If <15% decline: repeat dose day 7
- MULTI-DOSE: MTX 1mg/kg IM + leucovorin alternating
- Weekly β-hCG until undetectable
- Avoid intercourse, NSAIDs, folic acid during treatment
- Ectopic precautions: return if pain, bleeding
- Path rejoins step 05Shared downstream outcome
13Warning MTX Failure/Rupture Risk
Proceed to surgery if MTX fails or symptoms worsen
- Significant abdominal pain
- β-hCG rising >day 4
- <15% decline despite repeat dose
- Signs of rupture
- Proceed to laparoscopy
14Action Surgical Management
Laparoscopic approach preferred
- SALPINGECTOMY: Removal of tube (preferred if no fertility concerns)
- SALPINGOSTOMY: Tube-sparing (if contralateral tube absent/damaged)
- Follow β-hCG post-salpingostomy (persistent trophoblast risk)
- Laparoscopy preferred over laparotomy if stable
- Consider MTX prophylaxis after salpingostomy
- Path rejoins step 05Shared downstream outcome
- Path rejoins step 14Shared downstream outcome
- Path rejoins step 14Shared downstream outcome
15Action Pregnancy of Unknown Location (PUL)
No IUP or ectopic visualized, positive β-hCG
- β-hCG below discriminatory zone (1500-3000 mIU/mL)
- Follow serial β-hCG every 48-72 hours
- Normal rise: ≥53% in 48h at low levels
- Abnormal: <53% rise or plateau or decline
- Repeat TVUS when β-hCG reaches discriminatory zone
- Path rejoins step 10Shared downstream outcome
Guideline Source
ACOG Practice Bulletin No. 193: Tubal Ectopic Pregnancy
Clinical Safety Information
Clinical Decision Support — Not a Substitute for Clinical Judgment
Individual patient factors may require deviation from these recommendations.
Known Limitations
- Does not address non-tubal ectopic pregnancies (cervical, interstitial, cesarean scar)
- Methotrexate protocol requires close follow-up
- Institutional protocols for Rh status may vary
- Heterotopic pregnancy in IVF patients requires specialist management
Applicable Regions
USEUGlobal
US: Based on ACOG 2018 guidelines
Global: Medical management availability may vary
Version 1Next review: 2027-01-01
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Related Resources
Frequently Asked Questions
What is the Ectopic Pregnancy Management (ACOG 2018)?
The Ectopic Pregnancy Management (ACOG 2018) is a emergency clinical algorithm for Obstetrics & Gynecology. It provides a structured decision tree to guide clinical decision-making, based on ACOG Practice Bulletin No. 193: Tubal Ectopic Pregnancy.
What guideline is the Ectopic Pregnancy Management (ACOG 2018) based on?
This algorithm is based on ACOG Practice Bulletin No. 193: Tubal Ectopic Pregnancy (DOI: 10.1097/AOG.0000000000002560).
What are the limitations of the Ectopic Pregnancy Management (ACOG 2018)?
Known limitations include: Does not address non-tubal ectopic pregnancies (cervical, interstitial, cesarean scar); Methotrexate protocol requires close follow-up; Institutional protocols for Rh status may vary; Heterotopic pregnancy in IVF patients requires specialist management. Individual patient factors may require deviation from these recommendations.
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