Ectopic Pregnancy Diagnosis and Management

Initial Assessment and Stabilization

The American College of Emergency Physicians recommends stabilizing the patient first by assessing vital signs to determine hemodynamic stability, with up to 13% of symptomatic ED patients with first-trimester bleeding and pain being at risk for ectopic pregnancy 1, 2
Establish IV access if the patient shows any signs of instability, and initiate immediate resuscitation with fluids and blood products for unstable patients with hemorrhagic shock 3
The American College of Emergency Physicians suggests obtaining critical diagnostic tests immediately, including quantitative β-hCG and blood type and Rh status, with Rh-negative patients potentially requiring anti-D immunoglobulin administration 1, 3

The American College of Emergency Physicians recommends performing pelvic ultrasound regardless of β-hCG level, with transvaginal ultrasound being the preferred imaging modality, even when β-hCG is below traditional discriminatory thresholds 1, 2, 3
The sensitivity of ultrasound for detecting intrauterine pregnancy with β-hCG below 1,500 mIU/mL is only 33%, but this modest diagnostic performance still provides valuable information for risk stratification 4
Bedside ultrasound by emergency physicians can expedite diagnosis when available, and do not defer ultrasound based solely on β-hCG levels 1, 3

The American College of Emergency Physicians warns against assuming normal pregnancy based on low β-hCG alone without ultrasound confirmation, and deferring ultrasound because β-hCG is "too low" to see anything 1, 3
Failing to arrange concrete follow-up plans within 24-48 hours before discharge is also a critical pitfall to avoid 3
Consider anti-D immunoglobulin administration for threatened abortion, complete abortion, or ectopic pregnancy in Rh-negative patients 1, 3