title: Serum free beta-human chorionic gonadotrophin concentrations increase in unseparated blood specimens.
authors.affiliation: Regional Endocrine Laboratory, Royal Victoria Hospital, Belfast, UK.
authors.forename: H P
authors.initials: HP
authors.lastname: Stevenson
authors.forename: H
authors.initials: H
authors.lastname: Leslie
authors.forename: B
authors.initials: B
authors.lastname: Sheridan
mesh_terms: D015415:Biomarkers / Q000097:blood; D001800:Blood Specimen Collection; D006063:Chorionic Gonadotropin / Q000097:blood*; D018997:Chorionic Gonadotropin, beta Subunit, Human; D004314:Down Syndrome / Q000097:blood / Q000175:diagnosis*; D005260:Female; D006801:Humans; D010446:Peptide Fragments / Q000097:blood*; D011247:Pregnancy; D011296:Prenatal Diagnosis; D012307:Risk Factors; D013048:Specimen Handling
chemical_list: D015415:Biomarkers; D006063:Chorionic Gonadotropin; D018997:Chorionic Gonadotropin, beta Subunit, Human; D010446:Peptide Fragments