Our free Fibrosis-4 (Fib-4) Calculator provides a quick, non-invasive method to estimate the risk of advanced liver fibrosis or cirrhosis. It uses readily available lab values (AST, ALT, Platelets) and age to help healthcare professionals and individuals understand potential liver health. Get your Fib-4 score instantly!
Formula:
The Fibrosis-4 (Fib-4) index is calculated using the following formula:
Fib-4 = [Age (years) x AST (U/L)] / [Platelets (103/µL) x √ALT (U/L)]
- Age: Patient's age in years
- AST: Aspartate Aminotransferase level in Units/Liter
- Platelets: Platelet count in 103/microliter
- ALT: Alanine Aminotransferase level in Units/Liter