The mnemonic
RAS
What each word stands for
- RRespiratory rate 22 per minute or more
- AAltered mentation
- SSystolic blood pressure 100 mmHg or less
Why it matters clinically
Two or more points flags higher risk of death and prompts urgent assessment.
Where it stops being reliable
A prompt for risk, not a diagnostic test, and not sensitive enough to rule sepsis out.
Teaching aid, still awaiting independent review. Confirm facts in a standard source.