[Clinical efficacy of AST/ALT ratio and platelet counts as predictors of degree of fibrosis in HBV infected patients without clinically evident liver cirrhosis].

Background/aims: Hepatic fibrosis is an important prognostic factor in chronic hepatitis B. Liver biopsy is a gold standard diagnostic tool but an invasive procedure, so it cannot be done on all patients. We evaluated the clinical efficacy of AST/ALT ratio and platelet counts as predictors of fibrosis in chronic hepatitis B.

Methods: We reviewed retrospectively clinical records of 323 patients, who visited Kyungpook National University Hospital for chronic hepatitis B and underwent liver biopsy from September 1998 to May 2002. Correlation with laboratory parameters with hepatic fibrosis stage was identified.

Results: Of 323 patients, there were 278 male patients with mean age 27 (9~59). Platelet counts showed a significant correlation (r=-0.343, p=0.000), and AST/ALT ratio showed a weak but significant correlation (r=0.137, p=0.013) with fibrosis stage. Patients with severe fibrosis or cirrhosis (stage 3 and 4) can be identified to have AST/ALT ratio > 1 and platelet counts < 150,000/mm3, which showed with positive predictive value of 66.7%. Sensitivity, specificity, and negative predictive value were 14.6%, 97.5%, and 77.0%, respectively.

Conclusions: In chronic hepatitis B patients without clinical evidence of cirrhosis, severe hepatic fibrosis might be predicted using laboratory parameters of AST/ALT > 1 in combination with platelet counts. However, its sensitivity is too low to replace liver biopsy.