ATS/IDSA Severe CAP Criteria (2019)
ATS/IDSA 2019 severe community-acquired-pneumonia criteria (Metlay 2019).
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Major: septic shock requiring vasopressors
- No
- Major: respiratory failure requiring mechanical ventilation
- No
- Minor: respiratory rate >= 30/min
- Yes
- Minor: PaO2/FiO2 <= 250
- Yes
- Minor: multilobar infiltrates
- Yes
- Minor: confusion / disorientation
- No
- Minor: uremia
- No
- Minor: leukopenia
- No
- Minor: thrombocytopenia
- No
- Minor: hypothermia
- No
- Minor: hypotension requiring aggressive fluids
- No
Result: Severe CAP per ATS/IDSA 2019 (0 major + 3 minor criteria; >=1 major or >=3 minor); ICU admission per Metlay 2019 Table 1.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- not severe
- Not severe per ATS/IDSA 2019.
- severe
- Severe CAP per ATS/IDSA 2019 (>=1 major or >=3 minor); ICU admission per Metlay 2019 Table 1.
What you enter
- Major: septic shock requiring vasopressors
- Major: respiratory failure requiring mechanical ventilation
- Minor: respiratory rate >= 30/min
- Minor: PaO2/FiO2 <= 250
- Minor: multilobar infiltrates
- Minor: confusion / disorientation
- Minor: uremia (BUN >= 20 mg/dL)
- Minor: leukopenia (WBC < 4 x10^9/L)
- Minor: thrombocytopenia (platelets < 100 x10^9/L)
- Minor: hypothermia (core temp < 36 C)
- Minor: hypotension requiring aggressive fluids
How this is calculated
Metlay JP, Waterer GW, Long AC, et al. Diagnosis and Treatment of Adults with Community-acquired Pneumonia. An Official Clinical Practice Guideline of the American Thoracic Society and Infectious Diseases Society of America. Am J Respir Crit Care Med. 2019;200(7):e45-e67. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.