title: APRI: an easy and validated predictor of hepatic fibrosis in chronic hepatitis C.
abstract: OBJECTIVE
  To evaluate the aspartate aminotransferase/platelet ratio index (APRI) as a predictor of the presence or absence of significant fibrosis on liver biopsy of patients with chronic hepatitis C (HCV).
  
  
  BACKGROUND
  The decision to treat HCV is often made on the basis of the presence or absence of significant fibrosis on the liver biopsy. Because liver biopsy is expensive and invasive a noninvasive marker to evaluate hepatic fibrosis would be useful. The APRI is an easy to calculate index that is one of several markers that have been proposed.
  
  
  METHODS
  We retrospectively reviewed the charts of 339 patients with chronic HCV who had liver biopsies from January 2000 to March 2003. We subsequently evaluated 151 patients receiving pretreatment evaluation liver biopsies who had serum aspartate aminotransferase, platelets, routine liver function tests, and demographic data obtained. All liver biopsies were staged by the Batts Ludwig criteria.
  
  
  RESULTS
  The area under the curve of the receiver operator characteristics of the calculated APRI compared with the liver biopsy demonstrated that the fibrosis score was 0.889 in the prospective group and 0.790 in the retrospective group. To achieve predictive values of approximately 90%, useful cutoffs were found at 0.40 and 1.5 in the retrospective study, and 0.42 and 1.2 in the prospective study leaving intermediate zones of 58.9% and 41.1%, respectively. In the prospective group, 34 of 36 patients with a value of <0.42 were accurately predicted as having mild fibrosis, whereas 50 of 54 patients with a value >1.2 were accurately predicted to have significant fibrosis.
  
  
  CONCLUSIONS
  The APRI is a good estimator of hepatic fibrosis and was more accurate in a prospective group than a retrospective one. It potentially could be used to decrease the number of liver biopsies.
authors.affiliation: Department of Internal Medicine, Division of Gastroenterology, University of Texas Medical Branch, Galveston, TX, USA. nesnyder@utmb.edu
authors.forename: Ned
authors.initials: N
authors.lastname: Snyder
authors.forename: Leka
authors.initials: L
authors.lastname: Gajula
authors.forename: Shu-Yuan
authors.initials: SY
authors.lastname: Xiao
authors.forename: James
authors.initials: J
authors.lastname: Grady
authors.forename: Bruce
authors.initials: B
authors.lastname: Luxon
authors.forename: Daryl T-Y
authors.initials: DT
authors.lastname: Lau
authors.forename: Roger
authors.initials: R
authors.lastname: Soloway
authors.forename: John
authors.initials: J
authors.lastname: Petersen
mesh_terms: D000328:Adult; D000410:Alanine Transaminase / Q000097:blood; D019540:Area Under Curve; D001219:Aspartate Aminotransferases / Q000097:blood*; D015415:Biomarkers / Q000097:blood; D005260:Female; D006521:Hepatitis, Chronic / Q000097:blood / Q000175:diagnosis*; D006801:Humans; D008103:Liver Cirrhosis / Q000097:blood / Q000175:diagnosis* / Q000209:etiology; D008111:Liver Function Tests / Q000379:methods*; D008297:Male; D008875:Middle Aged; D010976:Platelet Count; D011237:Predictive Value of Tests; D011446:Prospective Studies; D012372:ROC Curve; D015203:Reproducibility of Results; D012189:Retrospective Studies
chemical_list: D015415:Biomarkers; D001219:Aspartate Aminotransferases; D000410:Alanine Transaminase