Modified Early Warning Score
Bedside early warning score to identify patients at risk of clinical deterioration
How to use & interpret
The Modified Early Warning Score (MEWS) is a track-and-trigger tool that aggregates basic physiological observations (respiratory rate, heart rate, systolic BP, temperature and conscious level) to flag deteriorating adults.
Rising scores prompt increasing levels of review and escalation. In the UK, MEWS has largely been standardised into NEWS2, which adds oxygen saturation scales and supplemental-oxygen scoring; use your organisation's adopted chart.
Score interpretation
MEWS 0–2: Low risk of deterioration
→ Routine monitoring; 4-hourly observations
MEWS 3–4: Increased risk of deterioration
→ Increase monitoring frequency; medical review within 30 minutes
MEWS ≥5: High risk of deterioration or cardiac arrest
→ Immediate medical review; consider ICU/HDU; continuous monitoring
Interpretation bands for the MEWS. Apply clinical judgement and local guidance.
Frequently asked questions
Is MEWS still used instead of NEWS2?
Most UK trusts have moved to NEWS2 for a single national standard. MEWS and local variants persist in some settings, but NEWS2 is now recommended.
References
- Subbe CP, et al. Validation of a modified Early Warning Score in medical admissions. QJM. 2001;94(10):521–6.
Related
Curated clinical cross-links plus same-class fallbacks.
- Hydrocortisone (Oral Replacement) · Glucocorticoid Replacement
- Morphine (Oral) · Strong Opioid Analgesic — Step 3 WHO Ladder
- Oxycodone · Strong Opioid Analgesic — Step 3 WHO Ladder
- Donanemab (Anti-Amyloid Monoclonal Antibody) · Anti-Amyloid Immunotherapy (IgG1 — Targets Pyroglutamate-Modified Amyloid-β)
- Melatonin Modified-Release (Elderly Insomnia) · Melatonin Receptor Agonist — Hypnotic
- Morphine Slow-Release (Elderly Chronic Pain) · Opioid Analgesic — Modified-Release Oral
- Difficult Airway Algorithm (DAS) · DAS 2015; Royal College of Anaesthetists
- Major Haemorrhage Protocol · NICE NG24; UK MHP guidelines
- New-Onset Atrial Fibrillation · ESC 2020 AF Guidelines; NICE NG196
- Hypertensive Emergency · ESC/ESH 2018 Hypertension Guidelines; NICE NG136
- Bradycardia Management · Resuscitation Council UK ABCDE; ESC 2021 Pacing Guidelines
- Ventricular Tachycardia / Fibrillation · Resuscitation Council UK ACLS; ESC 2022 Ventricular Arrhythmia Guidelines
Featured in these MRCEM clinical pathways
The MEWS is covered in detail — with RCEM/NICE evidence base, indications and pitfalls — in the following exam-focused pathways on our sister siteReviseMRCEM.
MRCEM Primary / Intermediate / OSCE candidates: each pathway includes exam-style questions, RCEM/NICE citations, and FAQ summaries.
Decision support only — verify against a current formulary, NICE, or your local guideline before clinical use.