| Nominal Level (µg/ml) | Measured Level Colistin A | Measured Level Colistin B | ||||
| Mean (SD) | CV (%) | Bias (%) | Mean (SD) | CV (%) | Bias (%) | |
| Intra-day (n = 10) |
|
| ||||
| 0.05 | 0.06 (0.01) | 2.7 | 10.5 | 0.05 (0.01) | 11.2 | 10.2 |
| 0.15 | 0.14 (0.01) | 3.1 | −3.6 | 0.15 (0.02) | 7.6 | 1.2 |
| 5.0 | 4.51 (0.28) | 6.3 | −9.1 | 4.93 (0.25) | 5.1 | 0.2 |
| 9.0 | 9.09 (1.03) | 11.4 | −1.8 | 8.64 (0.45) | 5.2 | −8.6 |
| Inter-day (n = 20) |
|
| ||||
| 0.05 | 0.05 (0.01) | 11.5 | 6.0 | 0.05 (0.01) | 9.9 | 3.0 |
| 0.15 | 0.14 (0.01) | 6.8 | 0.1 | 0.15 (0.01) | 6.7 | −1.0 |
| 5.0 | 4.87 (0.50) | 10.3 | −3.0 | 5.09 (0.37) | 7.3 | −0.3 |
| 9.0 | 9.25 (0.82) | 8.8 | 3.6 | 8.82 (0.64) | 7.2 | −4.7 |