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Alvarado Score for Acute Appendicitis Calculator

10-point MANTRELS score for likelihood of appendicitis.

Compute the Alvarado score, a 10-point clinical decision tool predicting acute appendicitis. Symptoms (migrating RLQ pain 1, anorexia 1, nausea/vomiting 1); Signs (RLQ tenderness 2, rebound 1, fever ≥ 37.3°C 1); Labs (leukocytosis ≥ 10,000 2, left shift ≥ 75% PMNs 1). Risk: 1-4 unlikely (discharge); 5-6 possible (observation/imaging); 7-10 probable (surgical consult).

Priya Venkatesan By Priya Venkatesan
Published Last reviewed 1 min read

Inputs

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

Sum the 8 MANTRELS components (max = 10).

In depth

Compute the Alvarado score, a 10-point clinical decision tool predicting acute appendicitis. Symptoms (migrating RLQ pain 1, anorexia 1, nausea/vomiting 1); Signs (RLQ tenderness 2, rebound 1, fever ≥ 37.3°C 1); Labs (leukocytosis ≥ 10,000 2, left shift ≥ 75% PMNs 1). Risk: 1-4 unlikely (discharge); 5-6 possible (observation/imaging); 7-10 probable (surgical consult).