CRB-65 (CAP severity, no BUN)
CRB-65 pneumonia severity (Lim 2003): confusion, RR >= 30, SBP < 90 or DBP <= 60, and age >= 65 (1 each); the 0-4 total maps to a 30-day mortality band and an outpatient/admit disposition.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Confusion (new-onset)
- Yes
- Respiratory rate >= 30/min
- No
- SBP < 90 or DBP <= 60
- No
- Age >= 65
- Yes
Result: CRB-65 2: 30-day mortality ~8.2% per Lim 2003; consider hospital management.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- 0
- 30-day mortality ~1.2% per Lim 2003; outpatient management likely appropriate.
- 1-2
- 30-day mortality ~8.2% per Lim 2003; consider hospital management.
- 3-4
- 30-day mortality ~31.4% per Lim 2003; urgent hospital management indicated.
What you enter
- Confusion (new-onset) (1)
- Respiratory rate >= 30/min (1)
- SBP < 90 or DBP <= 60 (1)
- Age >= 65 (1)
How this is calculated
Lim WS, van der Eerden MM, Laing R, et al. Defining community acquired pneumonia severity on presentation to hospital: an international derivation and validation study. Thorax. 2003;58(5):377-382. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.