Critical Issues in the Initial Evaluation and Management of Patients Presenting to the Emergency Department in Early Pregnancy
Official 2016 guideline from the American College of Emergency Physicians.
Recommendations
Diagnosis
Perform or obtain a pelvic ultrasound for symptomatic pregnant patients with any β-human chorionic gonadotropin (β-hCG) level.
Do not use the β-human chorionic gonadotropin (β-hCG) value to exclude the diagnosis of ectopic pregnancy in patients who have an indeterminate ultrasound result.
Literature