FIB-4 Calculator

Your details

FIB-4 was originally validated in adults aged roughly 35 to 65.
years
From a standard liver panel, in units per litre.
U/L
From a standard liver panel, in units per litre.
U/L
Pick the unit your lab uses. 10^9/L (SI) is the same number as 1000s per microlitre, so 200,000/µL = 200 in 10^9/L.
For adults 65 and over, AGA and EASL raise the lower cutoff from 1.45 to 2.0 because FIB-4 rises with age and over-calls fibrosis in older people.
FIB-4 indexIndeterminate
1.83
InterpretationIndeterminate
Lower cutoff applied1.45
APRI score0.5
AST / ALT ratio1.33
1.83
Low (< 1.45)<1.45Indeterminate (1.45-3.25)1.45-3.25High (> 3.25)3.25+

Your FIB-4 index is 1.83: indeterminate.

  • A FIB-4 between 1.45 and 3.25 is indeterminate: it neither rules fibrosis in nor out.
  • Indeterminate results often lead to a second test such as elastography (FibroScan) or an ELF blood test.
  • Your APRI score is 0.5, in the intermediate range (0.5 to 1.0).
  • FIB-4 can be less reliable in people under 35 or over 65, and in acute liver injury where AST and ALT spike.

Next stepShare this result with your doctor; it is a screening estimate, not a diagnosis.

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