Sample Concentration spiked (mg/L) Concentration found (mg/L) (Mean ± SD) Bias (%) Imprecision CV (%)
Flucloxacillin        
  LLOQ 0.0050 0.0052 ± 0.00017 4.5 3.2
  QC1 0.01 0.0105 ± 0.00048 4.7 4.6
  QC2 0.100 0.108 ± 0.0071 7.6 6.6
  QC3 1.00 1.02 ± 0.075 2.0 7.3
  QC4 10.0 10.2 ± 0.67 2.2 6.6
Cefazolin    
  LLOQ 0.0050 0.0051 ± 0.00011 2.0 2.1
  QC1 0.0100 0.0102 ± 0.00037 1.9 3.6
  QC2 0.100 0.099 ± 0.0059 -1.3 6.0
  QC3 1.00 0.94 ± 0.025 -5.7 2.6
  QC4 10.0 9.3 ± 0.23 -6.7 2.4
Table 4: Inter-day assay variance of the determination of flucloxacillin and cefazolin in plasma ultrafiltrate (n = 6).
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