MEWS Calculator | Modified Early Warning Score

MEWS Calculator

5 Physiological Parameters

Systolic Blood Pressure (mmHg)

Heart Rate (bpm)

Respiratory Rate (breaths/min)

Temperature (°C)

AVPU Consciousness Level

—

MEWS Score (max 17)

Interpretation

MEWS Score	Risk Level	Recommended Action
0–2	Normal	Routine monitoring; standard 4-hourly observations
3–4	Low Concern	Increase observation frequency; nurse to inform doctor
5–6	Medium Concern	Urgent medical review within 30 minutes; consider critical care outreach
≥ 7	High Concern	Emergency response; immediate medical assessment; ICU/HDU referral

Parameter	3	2	1	0	1	2	3
SBP (mmHg)	≤70	71–80	81–100	101–199	—	≥200	—
HR (bpm)	≥130	≤40	41–50	51–100	101–110	111–129	—
RR (br/min)	≥30	<9	—	9–14	15–20	21–29	—
Temp (°C)	—	<35.0	—	35.0–38.4	—	≥38.5	—
AVPU	Unresp.	Pain	Voice	Alert	—	—	—

Ward-based tool: MEWS is designed for nursing staff to calculate at the bedside using routine vital signs — no blood tests required.
Escalation threshold: A MEWS of 5 or above should trigger an urgent medical review within 30 minutes. Many hospitals use MEWS 5 as the call-out threshold for the Medical Emergency Team (MET).
Trends matter: A rising MEWS trend (e.g., 2→3→4 over 6 hours) warrants earlier escalation even if the threshold is not yet reached.
NEWS2 comparison: MEWS is simpler than NEWS2 but NEWS2 (7-parameter) has been adopted as the UK national standard. MEWS remains in common use in many centres and for rapid bedside triage.
Postoperative use: MEWS is particularly useful in the immediate postoperative period to detect early deterioration in patients returning from theatre to the ward.
A single AVPU score of V (responds to Voice) or below scores ≥1 and should always prompt reassessment regardless of the total score.

Subbe CP, et al. Validation of a modified early warning score in medical admissions. QJM. 2001;94(10):521–526.
Stenhouse C, et al. Prospective evaluation of a modified early warning score to aid earlier detection of patients developing critical illness on a general surgical ward. Br J Anaesth. 2000;84(5):663.
Royal College of Physicians. National Early Warning Score (NEWS) 2. London, 2017.