QC Concentration (nM) LVA LVA after 24-h storage Concentration (nM) Relative to QC Concentration (%) Concentration (nM) Relative to QC Concentration (%) 50 1.3 2.6 1.1 2.2 50 1.1 2.2 1.2 2.4 50 0.8 1.6 1.6 3.2 100 0.9 0.9 1.2 1.2 100 1.6 1.6 1.6 1.6 100 1.2 1.2 0.6 0.6

Table 2: Conversion of LV to LVA during sample preparation and storage in autosampler.