LQC (30 ng/mL) MQC (150 ng/mL) HQC (450 ng/mL)
  Calculated conc. (ng/mL) Accuracy (%) Calculated conc. (ng/mL) Accuracy (%) Calculated conc. (ng/mL) Accuracy (%)
1 26.64 88.8 149.31 99.5 466.43 103.7
2 33.16 110.5 133 88.7 405 90.0
3 28.9 96.3 130.52 87.0 403 89.6
4 24.1 80.3 117.73 78.5 331 73.6
5 29.65 98.8 146.4 97.6 444.02 98.7
6 28.42 94.7 121.8 81.2 362.2 80.5
Mean   94.9   88.7   89.3
%CV   10.7   9.6   12.5
Table 4: Matrix effect at LQC, MQC and HQC in six lots of plasma.