Analyte QC Level Spiked conc. (pg/ml) Mean (± SD) calculated conc. (pg/ml) %RSD %RE
Levonorgestrel LLOQQC 99.611 98.662 (± 6.349) 6.44 -0.95
  LQC 290.749 294.688 (± 8.943) 3.03 1.35
  MQC 14537.450 13983.266 (± 198.507) 1.42 -3.81
  HQC 27956.635 27147.911 (± 206.752) 0.76 -2.89
Table 2a: Intra-run or within batch (n=6) precision and accuracy of levonorgestrel in human plasma.