basic

SIRS Criteria Count Calculator

≥ 2 of 4 = systemic inflammatory response syndrome.

Count the Systemic Inflammatory Response Syndrome (SIRS) criteria a patient meets (out of 4): temperature, heart rate, respiratory rate / PaCO₂, and WBC. Two or more meets the SIRS definition.

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 criteria count = number of yes answers out of 4.

In depth

Count the Systemic Inflammatory Response Syndrome (SIRS) criteria a patient meets (out of 4): temperature, heart rate, respiratory rate / PaCO₂, and WBC. Two or more meets the SIRS definition.