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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