Red blood cell distribution width (RDW) was reported to be associated with the severity of liver diseases. We aimed to investigate the association between RDW and severity of liver inflammation in autoimmune hepatitis (AIH).Ninety-two consecutive AIH patients who underwent liver biopsy during 2016-2017 were included. Liver histology was evaluated using the Scheuer scoring system. Logistic regression analysis was used to analyze the risk factors for significant inflammation. The diagnostic accuracy was evaluated by the area under the receiver operating characteristic curve.The RDW level was higher in AIH patients with significant inflammation (14.6%, interquartile range: 13.2-16.3%) than in patients with mild inflammation (13.2%, interquartile range: 12.6-13.8%). The RDW level was correlated positively with the grades of liver inflammation (r=0.356, P<0.001). The area under the receiver operating characteristic curve of RDW in predicting significant inflammation was 0.739 (95% confidential interval: 0.634-0.843, P<0.001), with 67.80% sensitivity and 75.76% specificity. The diagnostic performance of RDW for significant inflammation was better than alanine aminotransferase (P=0.003) and immunoglobulin G (P=0.049). RDW (odds ratio=1.702, P=0.001) was identified as an independent predictor for significant inflammation by logistic multivariable analysis.The RDW level was correlated positively with the severity of liver inflammation in AIH patients. RDW can be a promising indicator for predicting significant liver inflammation in AIH.
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