ICU and Critical Care · Pulmonology
Murray Lung Injury Score calculator
Enter the published formula inputs below to calculate and interpret this score.
Clinical inputs
Allowed range: 0–4 quadrants
Number of quadrants with alveolar consolidation on the frontal chest radiograph (0–4).
Allowed range: 20–700 mm Hg
PaO₂/FiO₂. Points: ≥300 = 0, 225–299 = 1, 175–224 = 2, 100–174 = 3, <100 = 4.
Allowed range: 0–30 cm H₂O
PEEP points: ≤5 = 0, 6–8 = 1, 9–11 = 2, 12–14 = 3, ≥15 cm H₂O = 4.
Allowed range: 1–200 mL/cm H₂O
Static compliance points: ≥80 = 0, 60–79 = 1, 40–59 = 2, 20–39 = 3, ≤19 mL/cm H₂O = 4.
Result
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Clinical inputs
- Chest radiograph: alveolar consolidation quadrantsAccepted range: 0 to 4
- PaO₂/FiO₂ ratio (mm Hg)Accepted range: 20 to 700
- PEEP (cm H₂O)Accepted range: 0 to 30
- Static respiratory-system compliance (mL/cm H₂O)Accepted range: 1 to 200
Primary source
Murray JF et al. An expanded definition of the adult respiratory distress syndrome. Am Rev Respir Dis. DOI: 10.1164/ajrccm/138.3.720. PMID: 3202424. Scope: Lung Injury Score = mean of available component points. CXR quadrants of alveolar consolidation 0–4. PaO2/FiO2 ≥300/225–299/175–224/100–174/<100 = 0/1/2/3/4. PEEP ≤5/6–8/9–11/12–14/≥15 cm H2O = 0/1/2/3/4. Compliance ≥80/60–79/40–59/20–39/≤19 mL/cm H2O = 0/1/2/3/4. Score 0 none; 0.1–2.5 mild–moderate; >2.5 severe lung injury. (1988)
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