title: Beware the negative pregnancy test.
authors.affiliation: Department of Obstetrics and Gynaecology, The Royal Free Hospital, London, UK.
authors.forename: Samantha J
authors.initials: SJ
authors.lastname: Pretlove
authors.forename: Kay H
authors.initials: KH
authors.lastname: Lovell
authors.forename: P J
authors.initials: PJ
authors.lastname: Thompson
authors.forename: Wendy M N
authors.initials: WM
authors.lastname: Reid
mesh_terms: D000328:Adult; D006063:Chorionic Gonadotropin / Q000097:blood*; D003937:Diagnosis, Differential; D005188:False Negative Reactions; D005260:Female; D006801:Humans; D006939:Hyperemesis Gravidarum / Q000175:diagnosis*; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011272:Pregnancy, Multiple; D014310:Triplets
chemical_list: D006063:Chorionic Gonadotropin