FIB-4 Index Calculator
Non-invasive liver fibrosis score.
About FIB-4 Index Calculator
Non-invasive liver fibrosis score. The FIB-4 Index Calculator on Picscaler gives you the answer instantly in your browser, with no sign-up.
Inputs: Age (years), AST (U/L), ALT (U/L) and Platelet count (x10^9/L). Results shown: FIB-4 and Interpretation.
Formula: FIB-4 = (age x AST) / (platelets x10^9/L x sqrt(ALT)). Lower cut-off is 1.3 (2.0 if age 65 or over); upper cut-off 2.67. Not validated under age 35.
This tool is for education and information. It does not replace clinical judgement, so confirm results against your laboratory's reference ranges and local guidelines.
How to use FIB-4 Index Calculator
- Enter Age (years), AST (U/L), ALT (U/L) and Platelet count (x10^9/L).
- Press Calculate.
- Read FIB-4 and Interpretation in the result table.
- Use the formula and notes under the result to check the working.
Frequently asked questions
Is FIB-4 Index Calculator free?
Yes. FIB-4 Index Calculator is completely free to use on Picscaler.
Do I need to create an account?
No. You can use it straight away without signing up.
Is my data safe?
Your input is processed in your browser on your own device and is not uploaded to Picscaler.
Can I use it for medical decisions?
No. It is an educational aid and does not replace professional medical judgement.
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