National Early Warning Score 2 (NEWS2)

National Early Warning Score 2 (NEWS2)

NEWS2 is the standardised physiological scoring system developed by the Royal College of Physicians (RCP, UK) to identify acutely ill adult patients at risk of deterioration. It is used throughout the NHS to facilitate early recognition of clinical deterioration, trigger escalation of care, and improve communication between healthcare professionals.

For the FRCPath Medical Microbiology Part 2 examination, NEWS2 is particularly relevant because microbiologists are frequently consulted for patients with:

• Suspected sepsis

• Bloodstream infection

• Severe pneumonia

• Neutropenic sepsis

• Meningitis

• Severe skin and soft tissue infections

• ICU infections

The microbiologist should understand how NEWS2 influences urgency of microbiological advice, antimicrobial stewardship, blood culture timing, and escalation pathways.

Components of NEWS2

Physiological Parameter	Score 3	Score 2	Score 1	Score 0	Score 1	Score 2	Score 3
Respiratory rate (breaths/min)	≤8	—	9–11	12–20	21–24	—	≥25
Oxygen saturation (Scale 1)	≤91	92–93	94–95	≥96	—	—	—
Supplemental oxygen	+2 if receiving oxygen
Temperature (°C)	≤35.0	—	35.1–36.0	36.1–38.0	38.1–39.0	≥39.1	—
Systolic BP (mmHg)	≤90	91–100	101–110	111–219	—	—	≥220
Heart rate (/min)	≤40	—	41–50	51–90	91–110	111–130	≥131
Level of consciousness	Alert = 0; New confusion, Voice, Pain or Unresponsive = 3

Oxygen Saturation Scale

NEWS2 introduced two oxygen saturation scales.

Scale 1

Used for most adult patients.

Target oxygen saturation:

94–98%

Scale 2

Used ONLY in patients with confirmed hypercapnic respiratory failure, typically:

• COPD

• Obesity hypoventilation syndrome

• Neuromuscular disease

• Chest wall disease

Target oxygen saturation:

88–92%

Using Scale 2 avoids over-oxygenation and CO₂ retention.

Interpretation of NEWS2

NEWS2	Clinical Risk	Response
0	Very low	Routine monitoring
1–4	Low	Increase monitoring
3 in any parameter	Medium	Urgent clinical review
5–6	Medium	Urgent assessment by clinician
≥7	High	Emergency assessment/critical care review

Escalation Pathway

NEWS2 = 0

Routine observations

NEWS2 = 1–4

Ward doctor review

Repeat observations

Increase monitoring frequency

NEWS2 = Score 3 in one parameter

Immediate clinical review

Even if total score is low.

Example

Respiratory rate = 30/min

Everything else normal

NEWS2 = 3

Still requires urgent review.

NEWS2 = 5–6

Urgent assessment

Consider:

• Sepsis

• ICU referral

• Blood cultures

• Antibiotics

NEWS2 ≥7

Medical emergency

Immediate senior review

Critical care involvement

Resuscitation

Sepsis pathway

NEWS2 and Sepsis

NEWS2 does not diagnose sepsis.

Instead it identifies patients who may have severe illness requiring urgent assessment.

Typical pathway:

Patient deteriorates

↓

NEWS2 ≥5

↓

Assess for infection

↓

Apply Sepsis Six

↓

Microbiology consultation

↓

Antibiotics

↓

Source control

Sepsis Six

Within 1 hour

1. Oxygen

2. Blood cultures

3. IV antibiotics

4. IV fluids

5. Lactate measurement

6. Urine output monitoring

Microbiologists frequently advise on:

• Appropriate cultures before antibiotics

• Empirical therapy

• Antimicrobial stewardship

• De-escalation after microbiology results

NEWS2 in Microbiology Practice

Common referrals include:

Bloodstream infection

NEWS2 = 8

Positive blood culture

Immediate advice required

Severe CAP

NEWS2 = 7

Blood cultures

Urinary antigens

Respiratory PCR

Empirical antibiotics

Neutropenic sepsis

NEWS2 may initially be low

Never delay antibiotics solely because NEWS2 is low.

Meningitis

NEWS2 assists severity assessment

Does NOT replace clinical judgement.

Necrotising fasciitis

Often presents with:

• High NEWS2

• Septic shock

Requires urgent surgery plus antibiotics.

NEWS2 vs qSOFA

NEWS2	qSOFA
6 physiological variables	3 variables
Early warning score	Sepsis screening tool
Used throughout NHS	Mainly research/critical care
Sensitive	Less sensitive
Preferred in UK	Not recommended as sole screening tool

NEWS2 vs SOFA

NEWS2	SOFA
Bedside observations	Laboratory + physiology
Ward use	ICU use
Early detection	Organ failure assessment
No laboratory tests	Requires multiple laboratory parameters

Advantages

✔ Simple

✔ Standardised

✔ Rapid

✔ Reproducible

✔ Excellent communication tool

✔ Recognises deterioration early

Limitations

Does not diagnose:

• Sepsis

• Infection

• Shock

May underestimate severity in:

• Young fit patients

• Immunocompromised patients

• Neutropenic sepsis

• Early meningococcaemia

Clinical judgement always overrides NEWS2.

FRCPath Consultant Perspective

As the Consultant Microbiologist, you should:

• Ask for the NEWS2 score during urgent consultations to gauge illness severity.

• Use NEWS2 to prioritise the urgency of microbiology advice and laboratory processing (e.g., rapid blood culture review or molecular diagnostics).

• Ensure appropriate cultures are obtained promptly, but do not delay empirical antimicrobial therapy in suspected sepsis.

• Recommend escalation according to local sepsis and critical care pathways when NEWS2 indicates significant deterioration.

• Remember that NEWS2 complements—but does not replace—clinical assessment, microbiological findings, or infection-specific severity scores (e.g., CURB-65 for pneumonia).

FRCPath SOE Questions

Question 1

Why was NEWS2 introduced?

Model answer: To standardise the recognition and response to acute physiological deterioration across NHS settings, improve communication between healthcare professionals, and facilitate timely escalation of care.

Question 2

Does a NEWS2 score diagnose sepsis?

Model answer: No. NEWS2 identifies physiological deterioration and prompts clinical assessment. Sepsis is a clinical syndrome requiring suspected or confirmed infection with evidence of life-threatening organ dysfunction.

Question 3

What is the significance of a score of 3 in a single parameter?

Model answer: A score of 3 in any individual parameter is an escalation trigger requiring urgent clinical review, even if the total NEWS2 score is low.

Question 4

When is Oxygen Saturation Scale 2 used?

Model answer: In patients with confirmed hypercapnic respiratory failure (e.g., selected COPD patients) who require a target oxygen saturation of 88–92%.

💎 FRCPath Key Points Summary

• NEWS2 is the NHS standard early warning score for adults.

• It assesses six physiological parameters plus supplemental oxygen.

• A single score of 3 in any parameter warrants urgent review.

• NEWS2 ≥5 should prompt urgent assessment for serious illness, including possible sepsis.

• NEWS2 ≥7 indicates high clinical risk and usually requires emergency assessment and consideration of critical care.

• NEWS2 does not diagnose sepsis; it identifies patients who may be deteriorating.

• Scale 2 oxygen saturation scoring is reserved for patients with confirmed hypercapnic respiratory failure.

• In microbiology practice, NEWS2 helps prioritise urgent advice and supports—but does not replace—clinical judgement.

• Early antimicrobial therapy should not be delayed while calculating NEWS2 if sepsis is suspected.

• Understanding NEWS2 and its integration with sepsis pathways is a common expectation in the FRCPath Part 2 structured oral examination.