title: Correlation of β-human chorionic gonadotropin with ultrasound diagnosis of ectopic pregnancy in the ED.
authors.forename: Amy J
authors.initials: AJ
authors.lastname: Bloch
authors.forename: Scott A
authors.initials: SA
authors.lastname: Bloch
authors.forename: Matthew
authors.initials: M
authors.lastname: Lyon
mesh_terms: D015415:Biomarkers / Q000097:blood; D018997:Chorionic Gonadotropin, beta Subunit, Human / Q000097:blood*; D004636:Emergency Service, Hospital; D019160:Endosonography; D005260:Female; D006801:Humans; D011247:Pregnancy; D011271:Pregnancy, Ectopic / Q000097:blood / Q000175:diagnosis* / Q000000981:diagnostic imaging; D012189:Retrospective Studies
chemical_list: D015415:Biomarkers; D018997:Chorionic Gonadotropin, beta Subunit, Human