Free online FIB-4 Index Calculator for non-invasive liver fibrosis assessment. Based on age, AST, ALT, and platelet count. Suitable for NAFLD and chronic liver disease screening. All data computed locally in your browser.
FIB-4 (Fibrosis-4 Index) is a non-invasive blood-based index for assessing liver fibrosis. It uses age, AST, ALT, and platelet count. Widely used for NAFLD and chronic liver disease screening.
FIB-4 <1.30: advanced fibrosis can be excluded. FIB-4 1.30-2.67: indeterminate; further testing recommended. FIB-4 >2.67: suggests advanced fibrosis; specialist evaluation needed.
APRI (AST-to-Platelet Ratio Index) is another non-invasive fibrosis assessment. APRI <0.5 excludes significant fibrosis; >1.5 suggests significant fibrosis.