title: Short answer question case series: Abnormal first-trimester pregnancy.
authors.affiliation: Department of Emergency Medicine, David Geffen School of Medicine at UCLA, Harbor-UCLA Medical Center, Torrance, California 90509, USA.
authors.forename: Alisa K
authors.initials: AK
authors.lastname: Sato
authors.forename: Timothy B
authors.initials: TB
authors.lastname: Jang
mesh_terms: D000328:Adult; D015415:Biomarkers / Q000097:blood; D006063:Chorionic Gonadotropin / Q000097:blood; D005260:Female; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011271:Pregnancy, Ectopic / Q000175:diagnosis* / Q000000981:diagnostic imaging; D014463:Ultrasonography
chemical_list: D015415:Biomarkers; D006063:Chorionic Gonadotropin