APRI Calculator (AST to Platelet Ratio Index)

Your details

Aspartate aminotransferase (AST) from your most recent blood panel. Typical adult reference range is 10-40 IU/L.
IU/L
The upper limit of normal set by your laboratory for AST. Most labs use 40 IU/L; check your report if unsure.
IU/L
Platelet count from your complete blood count (CBC). A normal range is roughly 150-400 × 10⁹/L.
10⁹/L
APRI scoreIndeterminate
0.63

AST to Platelet Ratio Index

AST / ULN ratio1.125
Significant fibrosis likelihoodBorderline - score 0.5 to 0.7 is indeterminate for significant fibrosis
Cirrhosis likelihoodIntermediate - further evaluation recommended
0.63
Low risk<0.5Indeterminate0.5-1Fibrosis/Cirrhosis1-2Severe2+

Your APRI score is 0.63.

  • A score between 0.5 and 0.7 is indeterminate. Further evaluation with other non-invasive markers or liver biopsy may be needed.
  • Your AST of 45 IU/L is 5 IU/L above your lab's upper limit of normal (40 IU/L), which raises the APRI score.
  • APRI is most validated in hepatitis C populations. Its accuracy may differ in other liver conditions such as NAFLD or alcoholic liver disease.

Next stepDiscuss your result with a gastroenterologist or hepatologist. Additional non-invasive tests or imaging may help clarify fibrosis stage.

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