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Table 4 Results of Gram stain compared with GNR culture

From: Impact of Gram stain results on initial treatment selection in patients with ventilator-associated pneumonia: a retrospective analysis of two treatment algorithms

 

GNR growth in culturea

 

GNR on Gram stain

Yes

No

Total

Yes

71

24

95

No

4

32

36

Total

75

56

 
  1. a Sensitivity of Gram stain: 71/75 = 94.7%; specificity of Gram stain: 32/56 = 57.1%; negative predictive value: 32/36 = 88.9%; positive predictive value: 71/95 = 74.7%
  2. GNR Gram-negative rods
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Critical Care

ISSN: 1364-8535