title: Standardized hepatitis C virus RNA panels for nucleic acid testing assays.
abstract: BACKGROUND
  Methods for the quantification of hepatitis C virus (HCV) RNA are useful in the clinical management of infected patients. However, the introduction of assays based upon various nucleic acid testing (NAT) technologies, each utilizing a different set of standards, creates the potential for misinterpretation of patient results.
  
  
  OBJECTIVE
  In order to address the need for worldwide standardization of these assays, a HCV RNA quantification panel (NAP HCV-RNA) calibrated against the World Health Organization (WHO) First International Standard for HCV RNA was prepared. The eight-member HCV RNA quantification panel was evaluated utilizing a variety of commercially available and in-house NAT technologies.
  
  
  METHODS
  NAP HCV-RNA panels were tested and analyzed using the methods and data reduction protocols specific to each NAT technology employed in this study (bDNA, TMA and two PCR methods). Proprietary units of measure from each assay were compared to WHO International Units (IU) for each panel member (0, 50, 500, 5000, 50000, 200000, 500000 and 2000000 IU/ml).
  
  
  RESULTS
  Evaluation of the NAP HCV-RNA in a variety of NAT procedures demonstrated linearity across the range of target concentrations detected in each assay and R(2) values ranged from 0.9929 to 0.9995 across the four technologies. As expected, the correspondence of assay specific proprietary units to IU differed depending upon the technology utilized.
  
  
  CONCLUSIONS
  NAP HCV-RNA provides a consistent, standardized method for comparing results across laboratories and technologies and is useful in ensuring the quality of NAT testing for HCV RNA, independent of the methodology used.
authors.affiliation: AcroMetrix Corporation, 1440 Fourth Street, Berkeley, CA 94710, USA.
authors.forename: P A
authors.initials: PA
authors.lastname: Jorgensen
authors.forename: P D
authors.initials: PD
authors.lastname: Neuwald
mesh_terms: D005838:Genotype; D016174:Hepacivirus / Q000235:genetics*; D006526:Hepatitis C / Q000175:diagnosis / Q000821:virology*; D006801:Humans; D021141:Nucleic Acid Amplification Techniques / Q000592:standards*; D012367:RNA, Viral / Q000032:analysis*
chemical_list: D012367:RNA, Viral