title: Clinical, biochemical, immunological and virological profiles of, and differential diagnosis between, patients with acute hepatitis B and chronic hepatitis B with acute flare.
abstract: OBJECTIVE
  In areas with high or intermediate endemicity for chronic hepatitis B virus (HBV) infection, it is difficult to distinguish acute hepatitis B (AHB) from chronic hepatitis B with an acute flare (CHB-AF) in patients whose prior history of HBV infection has been unknown. The present study aimed to screen laboratory parameters other than immunoglobulin M antibody to hepatitis B core antigen (IgM anti-HBc) to discriminate between the two conditions.
  
  
  METHODS
  A retrospective and prospective study was conducted in patients first presenting clinically as HBV-related acute hepatitis to sort out acute self-limited hepatitis B (ASL-HB). Then, clinical and laboratory profiles were compared between patients with ASL-HB and CHB-AF. Parameters closely associated with ASL-HB were chosen to evaluate sensitivity, specificity, accuracy, positive predictive values and negative predictive values for diagnosing AHB.
  
  
  RESULTS
  There were significant differences between patients with ASL-HB and CHB-AF in relation to clinical and laboratory aspects, with many outstanding differences in levels of serum HBV-DNA, hepatitis B e antigen (HBeAg) and alpha-fetoprotein (AFP) as well as IgM anti-HBc. In particular, there was a greater difference between the two groups in low levels of HBeAg (ratio of the optical density of the sample to the cut-off value [S/CO] <20) than in negativity for HBeAg (42.7% and 13.5% vs 49.3% and 45.9%). 1:10 000 IgM anti-HBc had a sensitivity and specificity of 96.2% and 93.1%, respectively, for predicting ASL-HB. Combining it with AFP, HBeAg or HBV-DNA could improve diagnostic power. A combination of IgM anti-HBc, HBV-DNA and HBeAg had a predictive value of 98.9% and a negative predictive value of 100.0%, similar to that of a combination of IgM anti-HBc and HBV-DNA. Adding AFP to the combinations of IgM anti-HBc and HBV-DNA or HBeAg could further heighten the positive predictive value. The positive predictive value and negative predictive value of the combination of IgM anti-HBc, HBV-DNA and AFP were both 100.0%.
  
  
  CONCLUSIONS
  (i) There are significant differences with respect to clinical, biochemical, immunological and virological aspects between ASL-HB and CHB-AF. (ii) Of several diagnostic combinations, IgM anti-HBc jointing HBV-DNA is most effective and most practicable in distinguishing ASL-HB from CHB-AF. (iii) A low HBeAg level is more useful than negative HBeAg in differential diagnosis between ASL-HB and CHB-AF. (iv) In those patients with a high level of IgM anti-HBc, serum AFP level >10x upper reference limit could rule out a probability of ASL-HB.
authors.affiliation: Research Unit of Liver Disease, Shanghai No. 8 People's Hospital, Shanghai, China. hanyn88@163.com
authors.forename: Yongnian
authors.initials: Y
authors.lastname: Han
authors.forename: Qun
authors.initials: Q
authors.lastname: Tang
authors.forename: Wei
authors.initials: W
authors.lastname: Zhu
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Zhang
authors.forename: Longying
authors.initials: L
authors.lastname: You
mesh_terms: D000208:Acute Disease; D000328:Adult; D015415:Biomarkers / Q000097:blood; D004279:DNA, Viral / Q000097:blood; D003937:Diagnosis, Differential; D005260:Female; D006509:Hepatitis B / Q000175:diagnosis* / Q000235:genetics / Q000276:immunology; D006510:Hepatitis B Antibodies / Q000097:blood; D006513:Hepatitis B e Antigens / Q000097:blood; D006515:Hepatitis B virus / Q000235:genetics / Q000276:immunology; D019694:Hepatitis B, Chronic / Q000175:diagnosis* / Q000235:genetics / Q000276:immunology; D006801:Humans; D007075:Immunoglobulin M / Q000097:blood; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D011446:Prospective Studies; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D000509:alpha-Fetoproteins / Q000032:analysis
chemical_list: C097353:AFP protein, human; D015415:Biomarkers; D004279:DNA, Viral; D006510:Hepatitis B Antibodies; D006513:Hepatitis B e Antigens; D007075:Immunoglobulin M; D000509:alpha-Fetoproteins