Table 3.
Testing the TAC using the whole blood specimens.
| Target | TAC | Blood culture test | TAC | PPV | NPV | ||
|---|---|---|---|---|---|---|---|
| Positive | Negative | Sensitivity (%) | Specificity (%) | ||||
| S. aureus | Positive | 7 | 1 | 87.5% | 99.4% | 87.5% | 99.4% |
| Negative | 1 | 174 | |||||
| S. epidermidis | Positive | 11 | 2 | 78.6% | 98.8% | 84.6% | 98.2% |
| Negative | 3 | 167 | |||||
| S. hominis | Positive | 8 | 1 | 80.0% | 99.4% | 88.9% | 98.8% |
| Negative | 2 | 172 | |||||
| S. haemolyticus | Positive | 1 | 0 | 100.0% | 100.0% | 100.0% | 100.0% |
| Negative | 0 | 182 | |||||
| E. faecium | Positive | 4 | 2 | 100.0% | 98.9% | 66.7% | 100.0% |
| Negative | 0 | 177 | |||||
| E. faecalis | Positive | 2 | 1 | 66.7% | 99.4% | 66.7% | 99.4% |
| Negative | 1 | 179 | |||||
| S. pneumoniae | Positive | 10 | 1 | 83.3% | 99.4% | 90.9% | 98.8% |
| Negative | 2 | 170 | |||||
| S. agalactiae | Positive | 1 | 0 | 50.0% | 100.0% | 100.0% | 99.4% |
| Negative | 1 | 181 | |||||
| E. coli | Positive | 17 | 1 | 70.8% | 99.4% | 94.4% | 95.8% |
| Negative | 7 | 158 | |||||
| K. pneumoniae | Positive | 7 | 2 | 70.0% | 98.8% | 77.8% | 98.3% |
| Negative | 3 | 171 | |||||
| Ab | Positive | 12 | 1 | 92.3% | 99.4% | 92.3% | 99.4% |
| Negative | 1 | 169 | |||||
| P. aeruginosa | Positive | 1 | 3 | 100.0% | 98.4% | 25.0% | 100.0% |
| Negative | 0 | 179 | |||||
PPV, positive predictive value; NPV, negative predictive value.