Comparison of performance characteristics of blood culture, blood PCR, and any test being positive
| Test | Sensitivity (%) | Specificity (%) | Negative predictive value (%) | Positive predictive value (%) |
| Blood culture | 31 (24–38) | 100 | 57 (49–65) | 100 |
| Blood PCR | 47 (39–55) | 100 | 65 (58–73) | 100 |
| Any test positive1-150 | 72 (65–79) | 100 | 77 (70–84) | 100 |
↵1-150 Blood or CSF culture, blood or CSF PCR, blood latex antigen detection test, and throat swab culture (95% confidence intervals in brackets).