FIB-4 for Noninvasive Diagnosis of Hepatic Fibrosis

Non-invasively identify hepatic fibrosis

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In Sterling et al, which studied patients co-infected with HIV and Hepatitis C, a simple, non-invasive index (FIB-4) was developed to identify significant hepatic fibrosis.

The formula for FIB-4 is: Age ([yr] x AST [U/L]) / ((PLT [10(9)/L]) x (ALT [U/L])(1/2)).

The AUROC of the index was 0.765 for differentiation between Ishak stage 0-3 and 4-6. At a cutoff of <1.45 in the validation set, the negative predictive value to exclude advanced fibrosis (stage 4-6) was 90% with a sensitivity of 70%. A cutoff of >3.25 had a positive predictive value of 65% and a specificity of 97%. Using these cutoffs, 87% of the 198 patients with FIB-4 values outside 1.45-3.25 would be correctly classified, and liver biopsy could be avoided in 71% of the validation group.


Sterling RK, Lissen E, Clumeck N, et. al.

Development of a simple noninvasive index to predict significant fibrosis patients with HIV/HCV co-infection.

Hepatology: Official Journal of the American Association for the Study of Liver Diseases 2006, 43 (6): 1317-25

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