FIB-4 index for liver fibrosis
Noninvasive estimate of advanced liver fibrosis.
Inputs
0 of 4years
U/L
U/L
× 10⁹/L
Patient values are shared with every calculator.
When to use
- Fatty liver disease or viral hepatitis risk stratification.
Pearls and pitfalls
- Below 1.3 (below 2.0 if age 65 or older): low risk; 1.3–2.67: elastography; above 2.67: high risk, refer.
- Less reliable under age 35.
Why use
First step in the AASLD fibrosis pathway.
FIB-4 = age × AST ÷ (platelets × √ALT)