title: Evaluation of the clinical performance of the Beckman Coulter Access AbHBsII immunoassay for the detection of hepatitis B surface antibodies.
abstract: BACKGROUND
  Hepatitis B virus (HBV) surface antibodies (anti-HBs) testing is useful in various clinical circumstances, including identification of HBV susceptible individuals in pre- and post-vaccination programs.
  
  
  OBJECTIVE
  To assess the clinical performance of Beckman Coulter's anti-HBs chemiluminescence immunoassay (Access AbHBsII).
  
  
  METHODS
  Laboratory performances were evaluated on 1207 routine samples pre-screened with Abbott Axsym anti-HBs assay and divided into three different panels: vaccinated subjects (n=232), subjects with resolved HBV infection (n=150) and negative subjects for anti-HBs (n=825). Sera with discrepant results were resolved by an alternative method and further chart review.
  
  
  RESULTS
  The overall concordance between Access and Axsym assays was 95.8%. The relative sensitivity, relative specificity, positive predictive value and negative predictive value were 97.8%, 98.1%, 96%, and 99%, respectively. Of the 51 discrepant results, eight were false negative by Access, fifteen were false positive by Access, including sera from seven pregnant women, two patients with acute leukemia, and four with inflammatory syndromes.
  
  
  CONCLUSIONS
  The Beckman Coulter's Access AbHBsII assay displays satisfactory relative sensitivity and specificity performances. The assay has good precision and reliability and is technically simple and fast.
authors.affiliation: Laboratoire de Virologie, Centre Hospitalo-Universitaire Timone et CNRS UMR 6020 IFR48, Université de la Méditerranée, Marseille, France.
authors.forename: Anne
authors.initials: A
authors.lastname: Motte
authors.forename: Philippe
authors.initials: P
authors.lastname: Colson
authors.forename: Catherine
authors.initials: C
authors.lastname: Tamalet
mesh_terms: D006509:Hepatitis B / Q000175:diagnosis*; D006514:Hepatitis B Surface Antigens / Q000032:analysis*; D006801:Humans; D007118:Immunoassay / Q000295:instrumentation* / Q000379:methods; D008163:Luminescent Measurements; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D006514:Hepatitis B Surface Antigens