title: Diagnosis of ectopic pregnancy.
authors.forename: K
authors.initials: K
authors.lastname: Barnhart
authors.forename: C
authors.initials: C
authors.lastname: Coutifaris
mesh_terms: D000465:Algorithms; D006063:Chorionic Gonadotropin / Q000097:blood*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011271:Pregnancy, Ectopic / Q000097:blood / Q000175:diagnosis*
chemical_list: D006063:Chorionic Gonadotropin