Table 2.
Comparison of VRE culture to Xpert vanA PCRa
| Test | No. of isolates with each set of resultsb |
Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) | |||
|---|---|---|---|---|---|---|---|---|
| Reference+, test+ | Reference+, test− | Reference−, test+ | Reference−, test− | |||||
| VRE direct culture | 56 | 18 | 0 | 226 | 75.7 (64.3–84.9) | 100 (98.4–100) | 100 (93.6–100) | 92.6 (88.6–95.6) |
| Xpert vanA PCR | 74 | 0 | 7 | 219 | 100 (95.1–100) | 96.9 (93.7–98.8) | 91.3 (83.0–96.5) | 100 (98.3–100) |
a
Values in parentheses are the 95% confidence interval.
b
Reference, direct culture and results of enriched broth culture and/or chart review for discordant specimens; reference+, positive result for the reference; test+, positive result for the indicated test.