basic

APRI (AST to Platelet Ratio Index) Calculator

APRI = (AST / ULN_AST) / platelet_10⁹/L × 100.

Compute the AST-to-Platelet Ratio Index (APRI) — a non-invasive estimate of liver fibrosis in chronic hepatitis C: APRI = (AST / upper_limit_normal_AST) / platelets(10⁹/L) × 100. APRI > 1.0 suggests significant fibrosis; > 2.0 suggests cirrhosis.

Priya Venkatesan By Priya Venkatesan
Published Last reviewed 1 min read

Inputs

IU/L
IU/L
×10⁹/L

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

APRI = (AST / ULN_AST) / platelet × 100

In depth

Compute the AST-to-Platelet Ratio Index (APRI) — a non-invasive estimate of liver fibrosis in chronic hepatitis C: APRI = (AST / upper_limit_normal_AST) / platelets(10⁹/L) × 100. APRI > 1.0 suggests significant fibrosis; > 2.0 suggests cirrhosis.