Liver Fibrosis Score (FIB-4) Calculator
Calculate the FIB-4 index for non-invasive liver fibrosis assessment using age, AST, ALT, and platelet count. Includes APRI score and NAFLD-specific cutoffs.
Medical Disclaimer
This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about your health. Never disregard professional medical advice or delay seeking it because of results from this tool.
Inputs
Results
FIB-4 Index
1.37
Risk Category (0–2)
0
How to Use This Calculator
- Enter the patient's Age in years, AST in U/L, and ALT in U/L from current laboratory results.
- Enter Platelet Count in ×10⁹/L to complete the FIB-4 formula.
- Review the FIB-4 Index — values below 1.30 suggest low fibrosis risk, above 2.67 suggests advanced fibrosis.
- Check the APRI Score and AST/ALT Ratio (De Ritis) for additional non-invasive fibrosis markers.
- Use the risk category to guide decisions about liver biopsy or specialist referral.
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