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SIRS Systemic Inflammatory Response Calculator

≥2 of 4 SIRS criteria → SIRS positive.

Evaluates the four SIRS criteria (temperature, heart rate, respiratory rate/PaCO₂, WBC) and reports how many are met. SIRS is positive when ≥2 criteria are present.

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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

SIRS+: temp abnormal OR HR>90 OR RR>20 OR WBC abnormal; ≥2 criteria = SIRS

In depth

Evaluates the four SIRS criteria (temperature, heart rate, respiratory rate/PaCO₂, WBC) and reports how many are met. SIRS is positive when ≥2 criteria are present.