Table 1. Nominal and Calculated Concentration of Validation/Quality Control (QC) Data Points with Standard Deviation, Coefficient of Variation (% CV), and Calculated % Difference.

QC sample	nominal concentration [nmol/g]	mean of the calculated concentration [nmol/g]	standard deviation	% CV	% difference
high QC	163.0	150.68	16.66	11.09	7.55
middle QC	122.6	162.32	7.29	4.49	32.40
low QC	68.6	67.01	11.78	17.58	2.32