QC Concentration (nM) LV LV after 24-h storage Concentration (nM) Relative to QC Concentration (%) Concentration (nM) Relative to QC Concentration (%) 50 0.8 1.6 1.8 3.6 50 0.5 1.0 0.6 1.2 50 0.4 0.8 0.5 1.0 100 1.3 1.3 1.7 1.7 100 1.0 1.0 1.2 1.2 100 1.0 1.0 0.7 0.7

Table 3: Conversion of LVA to LV during sample preparation and storage in autosampler.