| Sensitivity, specificity and predictive values | β lactamase test methods | ||
| Chromogenic method | Iodometric method | Acidimetric method | |
| Sensitivity | 98.93% | 98.4% | 97.33% |
| Specificity | 93.1% | 96.55% | 89.65% |
| Efficiency | 98.51% | 98.27% | 96.78% |
| Positive predictive value | 99.46% | 99.73% | 99.18% |
| Negative predictive value | 87.09% | 82.35% | 72.22% |