title: Results of the first international round robin for the quantification of urinary and plasma hepcidin assays: need for standardization.
abstract: The recently discovered iron regulatory peptide hormone hepcidin holds promise as a novel biomarker in iron metabolism disorders. To date, various mass spectrometry and immunochemical methods have been developed for its quantification in plasma and urine. Differences in methodology and analytical performance hinder the comparability of data. As a first step towards method harmonization, several hepcidin assays were compared. Worldwide eight laboratories participated in a urinary and plasma round robin in which hepcidin was analyzed. For both urine and plasma: (i) the absolute hepcidin concentrations differed widely between methods, (ii) the between-sample variation and the analytical variation of the methods are similar. Importantly, the analytical variation as percentage of the total variance is low for all methods, indicating their suitability to distinguish hepcidin levels of different samples. Spearman correlations between methods were generally high. The round robin results inform the scientific and medical community on the status and agreement of the current hepcidin methods. Ongoing initiatives should facilitate standardization by exchanging calibrators and representative samples.
authors.affiliation: Department of Clinical Chemistry, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
authors.forename: Joyce J C
authors.initials: JJ
authors.lastname: Kroot
authors.forename: Erwin H J M
authors.initials: EH
authors.lastname: Kemna
authors.forename: Sukhvinder S
authors.initials: SS
authors.lastname: Bansal
authors.forename: Mark
authors.initials: M
authors.lastname: Busbridge
authors.forename: Natascia
authors.initials: N
authors.lastname: Campostrini
authors.forename: Domenico
authors.initials: D
authors.lastname: Girelli
authors.forename: Robert C
authors.initials: RC
authors.lastname: Hider
authors.forename: Vasiliki
authors.initials: V
authors.lastname: Koliaraki
authors.forename: Avgi
authors.initials: A
authors.lastname: Mamalaki
authors.forename: Gordana
authors.initials: G
authors.lastname: Olbina
authors.forename: Naohisa
authors.initials: N
authors.lastname: Tomosugi
authors.forename: Chris
authors.initials: C
authors.lastname: Tselepis
authors.forename: Douglas G
authors.initials: DG
authors.lastname: Ward
authors.forename: Tomas
authors.initials: T
authors.lastname: Ganz
authors.forename: Jan C M
authors.initials: JC
authors.lastname: Hendriks
authors.forename: Dorine W
authors.initials: DW
authors.lastname: Swinkels
mesh_terms: D023181:Antimicrobial Cationic Peptides / Q000097:blood* / Q000652:urine*; D015415:Biomarkers / Q000097:blood / Q000652:urine; D019411:Clinical Laboratory Techniques / Q000592:standards*; D064451:Hepcidins; D006801:Humans; D007150:Immunohistochemistry / Q000379:methods / Q000592:standards; D007391:International Cooperation; D019189:Iron Metabolism Disorders / Q000097:blood / Q000175:diagnosis / Q000652:urine; D013058:Mass Spectrometry / Q000379:methods / Q000592:standards; D012015:Reference Standards
chemical_list: D023181:Antimicrobial Cationic Peptides; D015415:Biomarkers; C578702:HAMP protein, human; D064451:Hepcidins