Analyte QC Level Spiked conc.(pg/ml) Mean (± SD) calculated conc. (pg/ml) %RSD %RE
Levonorgestrel LLOQQC 99.611 98.504 (± 4.856) 4.30 -1.11
  LQC 290.749 289.709 (± 10.092) 3.48 -0.36
  MQC 14537.450 13875.116 (± 336.590) 2.43 -4.56
  HQC 27956.635 27032.801 (± 811.777) 3.00 -3.30
Table 2b: Inter-run or between batch (n=24) precision and accuracy of levonorgestrel in human plasma.