AST to Platelet Ratio Index (APRI)
Measured aspartate aminotransferase. Must be at least 0.
IU/L
Use the limit from the performing laboratory; 40 IU/L is a common reference when no other value is supplied.
IU/L
Platelet count. Must be greater than 0.
10^9/L
Clinical noticeThis calculation does not replace clinical assessment.
Context and use
Formula
APRI = ((AST / AST upper limit of normal) / platelet count) × 100
