| Nominal Level (µg/ml) | Colistin A | **Accuracy (%) | Mean (SD) | Colistin B | ||
| Mean (SD) | *CV (%) | *CV (%) | **Accuracy (%) | |||
| 0.05 | 0.05 (0.01) | 8.6 | 107 | 0.05 (0.01) | 7.8 | 108 |
| 0.1 | 0.10 (0.01) | 8.4 | 102 | 0.10 (0.01) | 4.6 | 104 |
| 0.2 | 0.19 (0.02) | 9.1 | 100 | 0.21 (0.02) | 8.5 | 105 |
| 0.5 | 0.51 (0.06) | 11.2 | 100 | 0.51 (0.04) | 7.7 | 103 |
| 1.0 | 0.98 (0.11) | 11.4 | 99 | 1.01 (0.09) | 8.9 | 101 |
| 2.0 | 2.02 (0.21) | 10.3 | 101 | 2.20 (0.12) | 6.2 | 101 |
| 4.0 | 4.10 (0.28) | 6.9 | 102 | 4.01 (0.12) | 3.1 | 100 |
| 6.0 | 5.90 (0.51) | 8.6 | 98 | 5.94 (0.44) | 7.4 | 99 |
| 8.0 | 7.68 (0.74) | 9.6 | 96 | 7.68 (0.61) | 8.0 | 96 |
| 10.0 | 10.27 (0.44) | 4.3 | 103 | 10.27 (0.42) | 4.0 | 103 |