Stability study for each analyte.

QCLOQ is QC at LLOQ concentration, QCL is QC at low concentration, QCM is QC at medium concentration and QCH is QC at high concentration. LEV is levetiracetam and UCB L057 is its carboxylic metabolite. CV is coefficient of variation and is expressed in percentage (%).RT is room temperature. The presented data in this table are calculated as % deviation (% CV).*Analytes and IS are spiked into reagent at 1∶50 dilution ratio.Stability study for each analyte.

QCLOQ指定量下限（Lower Limit of Quantitation, LLOQ）浓度下的质量控制（Quality Control, QC）样品；QCL为低浓度质量控制样品，QCM为中浓度质量控制样品，QCH为高浓度质量控制样品。LEV为左乙拉西坦（levetiracetam），UCB L057为其羧酸类代谢产物。变异系数（coefficient of variation, CV）以百分比（%）表示。室温（room temperature, RT）。本表格所呈现的数据以偏差百分比（% deviation）与变异系数百分比（% CV）形式计算得出。*注：待测物与内标（internal standard, IS）以1∶50的稀释比例加入试剂中。本研究针对各待测物开展稳定性考察。