title: Laboratory evaluation of the UniCel DxI 800 analyser (Beckman Coulter) for detecting HBV and HCV serological markers.
abstract: BACKGROUND
  Due to their high prevalence, hepatitis B virus (HBV) and hepatitis C virus (HCV) infections need accurate and rapid diagnosis tools.
  
  
  OBJECTIVE
  Technical performances of the UniCel DxI 800 analyser (Beckman Coulter) and a comparison with the Vitros ECi (Ortho Clinical Diagnostics) were performed for five serological markers: HBsAg, total anti-HBc, anti-HBc IgM, anti-HBs and anti-HCV.
  
  
  METHODS
  Reproducibility was determined by repeated tests on the manufacturers' controls. The performance of the UniCel DxI 800 was assessed by testing negative and positive samples previously analysed with the Vitros ECi. The accuracy and linearity of anti-HBs assay were evaluated using the WHO international standard (W1042).
  
  
  RESULTS
  The intra-assay and inter-assay coefficients of variation were: 0.8% and 4.4% for HBsAg, 2.4% and 6.2% for anti-HBc, 5% and 8.7% for anti-HBc IgM, 2.1% and 5.1% for anti-HBs and 3.7% and 7.4% for anti-HCV. The two methods were concordant: 100% agreement for the five markers except for the negative HBsAg sera (99%). The anti-HBs results correlated well with the Vitros ECi (r=0.925 with p<0.0001) and the WHO standard (r2=0.9996). Throughput was 216 tests/h.
  
  
  CONCLUSIONS
  The high throughput, specificity and sensitivity make UniCel DxI 800 assays useful for routine diagnoses of HCV and HBV infections.
authors.affiliation: Laboratoire de Virologie, Institut Fédératif de Biologie, 330 avenue de Grande Bretagne, TSA 40031, 31059 Toulouse Cedex 9, France. miedouge.m@chu-toulouse.fr
authors.forename: Marcel
authors.initials: M
authors.lastname: Miedouge
authors.forename: Florence
authors.initials: F
authors.lastname: Legrand-Abravanel
authors.forename: Colette
authors.initials: C
authors.lastname: Lalanne
authors.forename: Karine
authors.initials: K
authors.lastname: Saune
authors.forename: Jacques
authors.initials: J
authors.lastname: Izopet
mesh_terms: D019411:Clinical Laboratory Techniques / Q000379:methods*; D016174:Hepacivirus / Q000276:immunology; D006509:Hepatitis B / Q000175:diagnosis*; D006510:Hepatitis B Antibodies / Q000097:blood*; D006514:Hepatitis B Surface Antigens / Q000097:blood*; D006515:Hepatitis B virus / Q000276:immunology; D006526:Hepatitis C / Q000175:diagnosis*; D018937:Hepatitis C Antibodies / Q000097:blood*; D006801:Humans; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012698:Serologic Tests / Q000379:methods
chemical_list: D006510:Hepatitis B Antibodies; D006514:Hepatitis B Surface Antigens; D018937:Hepatitis C Antibodies