title: Maternal serum-free beta-human chorionic gonadotrophin level: the effect of sample transportation.
authors.affiliation: Department of Clinical Medicine, University of Leeds, UK.
authors.forename: H S
authors.initials: HS
authors.lastname: Cuckle
authors.forename: R G
authors.initials: RG
authors.lastname: Jones
mesh_terms: D000328:Adult; D001800:Blood Specimen Collection; D006063:Chorionic Gonadotropin / Q000097:blood*; D004314:Down Syndrome / Q000175:diagnosis*; D005260:Female; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis; D012044:Regression Analysis; D012307:Risk Factors; D013997:Time Factors
chemical_list: D006063:Chorionic Gonadotropin