Liver stiffness measurement in non-alcoholic fatty liver disease: Two is better than one.

Abstract

Repeating liver stiffness measurement (LSM) was recently reported to improve accuracy to diagnose fibrosis stage in patients with non-alcoholic fatty liver disease (NAFLD). There are to date no other studies confirming this finding. This aims to evaluate the accuracy of repeating LSM for the diagnosis of fibrosis stage in NAFLD patients. Retrospective analysis of prospectively collected data on adult NAFLD patients who had two FibroScan examination within 6months prior to liver biopsy. F3-F4 fibrosis was excluded using LSM cut-off of 7.9kPa. A total of 136 patients were recruited. Eighty-five percent (115/136) of patients had high baseline LSM (≥7.9kPa). Among them, 25% (29/115) had low repeat LSM (<7.9kPa), with only two patients having F3 fibrosis. Forty-eight percent (41/86) of patients with high baseline and repeat LSMs had greater than or equal to F3-F4 fibrosis. All 21 patients with low baseline LSM had F0-F2 fibrosis, except one patient with high repeat LSM who had F3 fibrosis. A strategy of repeating LSM, where only patients with high LSM on both baseline and repeat scans are considered for liver biopsy, will be able to reduce the number of patients being considered for liver biopsy from 85% to 63%. The sensitivity, specificity, positive predictive value, and negative predictive value based on only the baseline scan was 98%, 22%, 37%, and 95%, respectively, while based on the strategy of repeating LSM was 93%, 51%, 48%, and 94%, respectively. False positive diagnosis of advanced fibrosis in NAFLD patients can be reduced, and unnecessary liver biopsy can be avoided by repeating LSM.