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Table 4 Summary of sensitivities, specificities, positive and negative predictive values of the boronic acid disk test using different antibiotic substrates with different concentrations of APB, in the phenotypic detection of NDM producers

From: Boronic acid disk diffusion for the phenotypic detection of polymerase chain reaction-confirmed, carbapenem-resistant, gram-negative bacilli isolates

Antibiotic used in boronic acid disk test

No. of isolates confirmed by PCR as

Test performance

Possessing NDM

(n = 8)

Not possessing NDM (n = 13)

Sensitivity

Specific

Positive predictive value

Negative predictive value

IPM 300

6

3

75 %

76.92 %

66.67 %

83.33 %

MEM 300

7

8

87.5 %

38.46 %

46.67 %

83.33 %

IPM 600

7

8

87.5 %

38.46 %

46.67 %

83.33 %

MEM 600

7

9

87.5 %

30.77 %

43.75 %

80 %