Pulmonology

NIVO Score calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Chest radiograph consolidation

Glasgow Coma Scale

points

Allowed range: 3–15 points

14 or lower scores 1. 15 scores 0.

Atrial fibrillation

Arterial pH

Allowed range: 6.8–7.8 pH

Below 7.25 scores 1. 7.25 scores 0.

Hours from arrival to acidaemia

hours

Allowed range: 0–240 hours

More than 12 hours scores 2. Exactly 12 hours scores 0.

Extended MRC dyspnoea grade

Asked for a good day over the past 3 months. Grades 1 through 4 score 0. Grade 5a scores 2: too breathless to leave the house unassisted but independent in washing or dressing. Grade 5b scores 3: too breathless to leave the house unassisted and needs help with both washing and dressing. 5a and 5b are not added.

Result

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Clinical inputs

Chest radiograph consolidation
Glasgow Coma Scale (points)Accepted range: 3 to 15
Atrial fibrillation
Arterial pHAccepted range: 6.8 to 7.8
Hours from arrival to acidaemiaAccepted range: 0 to 240
Extended MRC dyspnoea grade

Primary source

Hartley T et al. The Noninvasive Ventilation Outcomes (NIVO) score. Eur Respir J. DOI: 10.1183/13993003.04042-2020. PMID: 33479109. Consolidation, Glasgow Coma Scale of 14 or lower, atrial fibrillation, and pH below 7.25 score 1 each. Time to acidaemia longer than 12 hours scores 2. eMRCD 5a scores 2 and eMRCD 5b scores 3. Grades 1–4 score 0. Validation in-hospital mortality was 5.0% for 0–2, 16.8% for 3–4, 41.2% for 5–6, and 71.4% for 7–9. (2021)

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