title: Anti-HCV reactive blood donors: clinical and epidemiological factors associated with false-reactive results.
abstract: BACKGROUND
  In certain clinical settings, false-reactive anti-hepatitis C virus (HCV) results are rare because the majority of persons being tested have evidence of liver disease and the specificity of the screening assays is high. However, among healthy populations, such as blood donors, mainly in regions with a low prevalence of HCV infection, this situation does occur. In this study, we sought to assess clinical, epidemiological, and laboratory characteristics of blood donors with false-reactive anti-HCV screening tests.
  
  
  METHODS
  This retrospective cross-sectional study included 537 anti-HCV reactive blood donors referred to a tertiary care centre for liver diseases.
  
  
  RESULTS
  The mean age was 36.5+/-11.2 years and 71.8% were men. Blood donors of older age (P=0.010), history of alcohol abuse (P=0.039), past transfusion (P<0.001), intravenous drug use (P<0.001), and with antibody against core antigen of hepatitis B virus reactivity (P=0.003) were less likely to have a false-reactive anti-HCV result. By multivariate analysis, only the absence of parenteral risk factors (prior transfusion and intravenous drug use) was independently associated with false-reactive anti-HCV tests.
  
  
  CONCLUSIONS
  Blood donors with reactive anti-HCV screening tests with no risk factors for parenterally acquired HCV infection are more likely to present with false-reactive results.
authors.affiliation: Division of Gastroenterology, Federal University of Sao Paulo, Sao Paulo, Brazil. janaina.narciso@uol.com.br
authors.forename: Janaína L
authors.initials: JL
authors.lastname: Narciso-Schiavon
authors.forename: Leonardo L
authors.initials: LL
authors.lastname: Schiavon
authors.forename: Roberto J
authors.initials: RJ
authors.lastname: Carvalho-Filho
authors.forename: Jaqueline R
authors.initials: JR
authors.lastname: Cardoso
authors.forename: Fernanda C F
authors.initials: FC
authors.lastname: Freire
authors.forename: Juliana P
authors.initials: JP
authors.lastname: Sampaio
authors.forename: José O
authors.initials: JO
authors.lastname: Bordin
authors.forename: Maria Angélica
authors.initials: MA
authors.lastname: Soares
authors.forename: Antonio Eduardo B
authors.initials: AE
authors.lastname: Silva
authors.forename: Maria Lucia G
authors.initials: ML
authors.lastname: Ferraz
mesh_terms: D000328:Adult; D001782:Blood Donors / Q000706:statistics & numerical data*; D004812:Epidemiologic Methods; D005189:False Positive Reactions; D005260:Female; D016174:Hepacivirus / Q000302:isolation & purification; D006526:Hepatitis C / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012367:RNA, Viral / Q000097:blood; D055815:Young Adult
chemical_list: D012367:RNA, Viral