Table 2.
Summary of sensitivities, specificities, positive and negative predictive values of the boronic acid disk test using different antibiotic substrates with different concentrations of APB, for the phenotypic detection of OXA-48 producers
| Antibiotic used in boronic acid disk test | No. of isolates confirmed by PCR as | Test performance | ||||
|---|---|---|---|---|---|---|
| Possessing OXA-48 (n = 24) | Not possessing OXA-48 (n = 13) | Sensitivity | Specific | Positive predictive value | Negative predictive value | |
| IPM 300 | 17 | 3 | 70.8 % | 76.92 % | 85 % | 58.82 % |
| MEM 300 | 18 | 8 | 75 % | 38.46 % | 69.23 % | 45.45 % |
| IPM 600 | 19 | 8 | 79.17 % | 38.46 % | 70.37 % | 50 % |
| MEM 600 | 20 | 9 | 83.33 % | 30.77 % | 68.97 % | 50 % |