IDInfectious Disease
IDSA/ATS Minor Criteria for Severe CAP
IDSA/ATS 2007 minor criteria for severe CAP requiring ICU admission. ≥3 criteria = severe.
RR ≥30 breaths/min
PaO₂/FiO₂ <250
Multilobar infiltrates
Confusion/disorientation
Uraemia (BUN ≥20 mg/dL)
Leucopenia (WBC <4×10⁹/L)
Thrombocytopenia (Platelets <100×10⁹/L)
Hypothermia (temp <36°C)
Hypotension requiring aggressive fluid resuscitation
0
Non-severe CAPpts/ 9
Non-severe CAP — ward admission appropriate
Reference: IDSA/ATS 2007
Medical Disclaimer: This calculator is a clinical decision support tool for qualified healthcare professionals. It does not replace clinical judgement. Always interpret results in the full clinical context. Reference: IDSA/ATS 2007.