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FIB-4 Calculator
Calculate Fibrosis-4 (FIB-4) index for liver scarring and fibrosis risk
FIB-4 Formula: $\text{FIB-4} = \frac{\text{Age} \times \text{AST}}{\text{Platelets} \times \sqrt{\text{ALT}}}$. Standard cutoffs for non-alcoholic fatty liver disease (NAFLD) or viral hepatitis usually consider scores < 1.45 as low risk and > 3.25 as high risk of advanced fibrosis. Enter patient values below.
Clinical & Laboratory Parameters Input
Calculation Results
⚠️ Not medical advice. For hepatology, gastroenterology, and clinical reference only. Liver fibrosis staging, staging accuracy, and management of chronic liver conditions must be evaluated by a qualified physician or hepatologist.