• Home
  • Fib-4 Calculator

Fib-4 Calculator

NCL Wide
Under Review — this page was due to be reviewed by Thursday, 10 November 2022. The information shown here may be outdated.

Fib-4 Calculator


FIB-4 Calculator for NAFLD

NB This is only valid for non-alcoholic fatty liver disease (NAFLD) and is intended for use in conjunction with the Camden and Islington Abnormal LFT pathway. Your local guidance may differ.

Please note The use of the FIB-4 score is not validated where a patient has normal transaminases or is over 75 years of age. Whilst the calculator will still give you a FIB-4 score, please make note of the error messages that may appear next to it.

This uses the FIB-4 formula: (age [yr]x AST [U/L]) / ((PLT [109/L]) x (√ALT [U/L]))

Calculator developed by Alex Warner.


Alternative calculator

Fibrosis stratification in NAFLD based upon:

FIB-4: McPherson S et al. Gut. 2010 Sep;59(9):1265-9.

ELF: Enhanced Liver Fibrosis Test Rosenberg et al. Gastroenterology. 2004 Dec;127(6):1704-13.

Combining ELF and FIB4 in NAFLD Tanwar et al. Hepatology. 2012, 56, 264A.


Review date: Thursday, 10 November 2022