Sample Concentrationspiked (mg/L) Concentration found (mg/L)(Mean ± SD) Bias(%) ImprecisionCV (%)
Intra-day        
  LLOQ 0.050 0.048 ± 0.0036 -4.00 7.5
  QC1 1.00 1.01 ± 0.04 0.83 3.9
  QC2 10.0 9.43 ± 0.34 -5.70 3.6
  QC3 50.0 49.5 ± 0.91 -0.92 1.9
Inter-day    
  LLOQ 0.050 0.050 ± 0.0034 -0.67 6.9
  QC1 1.00 1.00 ± 0.060 0.33 6.0
  QC2 10.0 10.0 ± 0.38 0.38 3.8
  QC3 50.0 49.5 ± 0.75 -1.1 1.5
Table 1: Intra- and inter-day assay variance of the determination of vancomycin in plasma (n = 6).
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