Clinical Tool

FIB-4 Calculator

Calculate the FIB-4 index for liver fibrosis risk assessment. A simple, non-invasive first step in the MAFLD screening pathway.

Enter Patient Data

Age (years)

AST (U/L)

ALT (U/L)

Platelet Count (10⁹/L)

Formula: (Age × AST) / (Platelets × √ALT)

Note: For patients aged >65 years, some guidelines suggest a higher lower cut-off (e.g. 2.0) to maintain specificity.

Enter all four values to calculate the FIB-4 score.