FIB-4 Index

Non-invasive liver fibrosis assessment.

Age

years

AST

U/L

ALT

U/L

Platelets

×10⁹/L

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FIB-4 Index

0.00

Low Risk

Unlikely advanced fibrosis (F0-F1). Repeat in 1-3 years.

Formula

FIB-4 = (Age × AST) / (Platelets × √ALT)

= (50 × 45) / (180 × √55) = 0.00

Interpretation

<1.3: Low risk (F0-F1)

1.3-2.67: Indeterminate

>2.67: High risk (F3-F4)

Frequently Asked Questions