title: External quality assessment in small schemes: the case of 17-alpha-hydroxyprogesterone.
authors.affiliation: Tenovus Institute for Cancer Research, University College of Medicine, Heath Park, Cardiff, UK.
authors.forename: G F
authors.initials: GF
authors.lastname: Read
authors.forename: R F
authors.initials: RF
authors.lastname: Walker
authors.forename: P
authors.initials: P
authors.lastname: Ford
authors.forename: D
authors.initials: D
authors.lastname: Riad-Fahmy
mesh_terms: D019326:17-alpha-Hydroxyprogesterone; D000312:Adrenal Hyperplasia, Congenital / Q000175:diagnosis*; D006801:Humans; D006908:Hydroxyprogesterones / Q000592:standards*; D007231:Infant, Newborn; D011785:Quality Assurance, Health Care; D011933:Reagent Kits, Diagnostic; D006113:United Kingdom
chemical_list: D006908:Hydroxyprogesterones; D011933:Reagent Kits, Diagnostic; D019326:17-alpha-Hydroxyprogesterone