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Table 1. Application of the oxygen section of the NEWS chart to 400 routine observations rounds for 22 patients on a respiratory ward with target oxygen saturation range of 88–92%. SpO2 Number of observations (%) Number with appropriate oximetry score in NEWS (%) Satisfactory 350 (87.5) > 270 had saturation within target range > 80 had saturation >92% breathing air 22/350 (6.3) > 22 had SpO2 ≥96% breathing air > 328 scored ‘too low’ in NEWS <88% 10 (2.5) 10/10 (100.0) All scored 3 points for hypoxaemia >92% breathing oxygen 40 (10.0) 0/40 (0.0) 34/40 scored ‘too low’ in NEWS Total 400 (100.0) 32/400 (8.0) In total, 19 patients had chronic obstructive pulmonary disease and three had complex lung disease with hypercapnia. NEWS = national early warning score; SpO2 = oxygen saturation.

Clinical and scientific letters: The national early warning score gives misleading scores for oxygen saturation in patients at risk of hypercapnia