Sample Concentration spiked (mg/L) Concentration found (mg/L) (Mean ± SD) Bias (%) Imprecision CV (%)
Flucloxacillin        
  LLOQ 0.0050 0.0051 ± 0.00032 2.0 6.3
  QC1 0.0100 0.0095 ± 0.00062 -4.7 6.5
  QC2 0.100 0.102 ± 0.0045 1.5 4.5
    QC3 1.00 1.05 ± 0.054 1.5 5.1
  QC4 10.0 10.1 ± 0.57 1.4 5.7
Cefazolin    
  LLOQ 0.0050 0.0052 ± 0.00029 4.0 5.6
  QC1 0.0100 0.0102 ± 0.00063 2.0 6.2
  QC2 0.100 0.102 ± 0.0055 2.1 5.4
  QC3 1.00 1.05 ± 0.048 5.3 4.5
  QC4 10.0 10.1 ± 0.57 1.4 5.7
Table 3: Intra-day assay variance of the determination of flucloxacillin and cefazolin in plasma ultrafiltrate (n = 6).
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