title: Preparation of fresh frozen human sera for external quality assessment.
abstract: A procedure for preparation of unmodified and modified fresh frozen human quality testing sera is described. The materials have been used for external quality assessment in Denmark. Examples of improvements in external quality assessment schemes using this type of material are shown.
authors.affiliation: Department of Clinical Chemistry, University of Copenhagen, Herlev Hospital, Denmark.
authors.forename: A
authors.initials: A
authors.lastname: Uldall
authors.forename: S
authors.initials: S
authors.lastname: Glavind-Kristensen
authors.forename: S
authors.initials: S
authors.lastname: Bak
mesh_terms: D000410:Alanine Transaminase / Q000097:blood; D001219:Aspartate Aminotransferases / Q000097:blood; D001774:Blood Chemical Analysis / Q000379:methods*; D001793:Blood Preservation / Q000379:methods*; D005615:Freezing; D006801:Humans; D011786:Quality Control
chemical_list: D001219:Aspartate Aminotransferases; D000410:Alanine Transaminase