Table 3. The accuracy of the BD Directigen Flu A+B influenza rapid test vs. RT-PCR for A and B.
| BD Directigen Flu A+B (RT) (Seasons 2003–2004, 2006–2007, 2007–2008 and 2008–2009) | PCR negative | PCR positive | Sensitivity % (95%CI1) | Specificity % (95% CI) | PPV2% (95% CI) | NPV3% (95% CI) |
|---|---|---|---|---|---|---|
| A | ||||||
| negative | 1356 | 346 | 44 (40–48) | 100 (99–100) | 98 (97–100) | 80 (78–81) |
| positive | 3 | 267 | ||||
| n = 1972 | 1359 | 613 | ||||
| B | ||||||
| negative | 968 | 141 | 37 (31–44) | 100 (99–100) | 97 (90–99) | 87 (85–89) |
| positive | 3 | 84 | ||||
| n = 1196 | 971 | 225 |
Key: CI—confidence interval
PPV—positive predictive value
NPV—negative predictive value