Test Condition Nominal Concentration (µg/ml) Calculated Concentration (µg/ml) Accuracy % Precision (% CV)

Bench top stability

0.2 0.22 ± 0.03 111.0 14.2
1 0.97 ± 0.05 96.6 5.1
15 14.65 ± 0.38 97.7 2.6

Freeze-thaw stability

0.2 0.22 ± 0.01 111.8 6.1
1 0.96 ± 0.03 96.0 3.3
15 15.18 ± 0.11 101.2 0.7

Post-preparative stability

0.2 0.21 ± 0.02 102.7 9.6
1 1.02 ± 0.04 102.5 3.7
15 14.78 ± 0.34 98.6 2.3

Short-term stability

0.2 0.22 ± 0.02 108.8 10.1
1 0.96 ± 0.01 95.7 1.0
15 14.49 ± 0.10 96.6 0.7

Long-term stability

1 Mon 0.2 0.21 ± 0.02 102.8 9.9
1 1.03 ± 0.07 103.3 6.9
15 14.65 ± 0.26 97.7 1.8
2 Mon 0.2 0.21 ± 0.01 105.0 1.4
1 1.08 ±0.06 107.5 5.6
15 14.60 ± 0.77 97.4 5.3
3 Mon 0.2 0.19 ± 0.01 96.7 3.4
1 0.94 ± 0.07 94.0 7.6
  15 13.86 ± 0.25 92.4 1.8
Table 3: Stability of vancomycin in mouse plasma samples (n=3).