Table 3 Performance of the biochip-based assay depending on the concentration of acid-fast bacilli in clinical samples (n = 61)
| Smear grade | No. of samples | Positive result on biochip | Negative result on biochip | Sensitivity |
|---|---|---|---|---|
| 3+ | 19 | 19 | 0 | 100% |
| 2+ | 13 | 10 | 3 | 77% |
| 1+ | 12 | 8 | 4 | 67% |
| 1-12 bacilli/300 fields | 8 | 6 | 2 | 75% |
| negative | 9 | 1 | 8 | 11% |