The APRI Calculator (AST to Platelet Ratio Index) is a non-invasive tool to estimate the likelihood of liver fibrosis and cirrhosis, particularly in patients with chronic viral hepatitis (Hepatitis B & C). It provides a quick, cost-effective score to assess liver health.
Formula:
APRI = ((AST (IU/L) / AST ULN (IU/L)) / Platelet Count (109/L)) × 100
Where:
- AST: Aspartate Aminotransferase level (in IU/L)
- AST ULN: Upper Limit of Normal for AST (in IU/L)
- Platelet Count: Platelet count (in 109/L)