FIB-4 Calculator

Estimate Fibrosis index. Educational screening only — not medical advice.

FIB-4

Use the fields below, then calculate. Results stay in your browser — for learning only, not medical advice.

Educational context

How this calculator works and what the numbers mean

This tool helps you explore FIB-4 using widely published formulas and screening ranges. Results are for learning and self-awareness — they are not a diagnosis and do not replace advice from a qualified clinician.

All math runs in your browser on DoseFirst. Results are rounded for display and meant for learning — not for prescribing, dosing medicines, or making treatment decisions on your own.

Formula used:


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

Sources & disclaimer

Where the method comes from and how to use results safely

Reference:

Peer-reviewed guidelines and reference equations commonly cited in public health and clinical education.

Educational use only

DoseFirst calculators are for general education and self-screening. They are not medical advice, do not diagnose conditions, and do not replace care from a qualified health professional.