SIRS Criteria
Systemic Inflammatory Response Syndrome
Temperature > 38°C or < 36°C
Heart Rate > 90/min
Respiratory Rate > 20/min or PaCO2 < 32 mmHg
WBC > 12,000, < 4,000 or > 10% bands
SIRS Criteria Met?
0/ 4
Negative (< 2)
Reviewed by the CareCalculus Clinical Team·MD, ICU & Emergency Medicine specialists·Updated 2026
Clinical Interpretation
If ≥ 2 criteria are met, the patient has SIRS. If SIRS is present with a suspected infection, it defines sepsis (per older Sepsis-2 guidelines).
Suggested Diagnostic Protocols
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