FIB-4 calculator

Quick assessment of liver fibrosis risk

Enter the laboratory values using the correct units. The calculator will show the FIB-4 score, risk category, and the recommended next step.

Formula FIB-4 = (age × AST) / (platelets × √ALT)

Step 1

Enter your values

Age (years) The test has limited reliability under age 35

AST (U/L) Aspartate aminotransferase

ALT (U/L) Alanine aminotransferase

Platelets (×10⁹/L) Enter, for example, 200, not 200,000

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