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. 2024 Feb 12;9(1):371–385. doi: 10.1089/can.2022.0216

Table 4.

Interday Accuracy and Precision of Analyte Quantification in Pre-Enhanced Matrix Removal Spiked Plasma

Measured amount (ng/mL)
Nominal quantity (ng/mL) Analyte Day 1
Day 2
Day 3
Mean %RSD Accuracy (%) Mean %RSD Accuracy (%) Mean %RSD Accuracy (%)
5 OH-THC 4.24 1.55 84.88 4.69 2.61 93.86 4.39 1.78 87.74
COOH-THC 4.48 2.10 89.62 4.27 1.92 85.39 4.42 2.40 88.44
CBD 4.60 0.11 92.06 4.46 1.79 89.19 4.45 2.34 89.04
THC 4.34 1.16 86.84 4.38 2.13 89.52 4.33 0.09 86.55
Anandamide 5.37 2.83 97.68 5.39 1.32 97.79 5.46 2.41 99.28
2-AG 13.61 4.39 108.89 14.56 8.90 96.10 16.03 6.01 105.15
VEA 6.23 1.08 102.60 6.47 2.46 106.91 6.18 1.90 101.69
OEA 6.34 0.79 96.09 6.29 4.04 95.76 6.33 0.07 96.07
PEA 9.90 13.14 107.25 9.89 8.94 108.89 10.06 10.85 108.14
50 OH-THC 50.92 3.04 101.84 56.89 1.64 113.79 51.18 3.06 102.35
COOH-THC 50.84 4.25 101.68 49.98 2.12 99.96 50.96 2.01 101.92
CBD 50.99 4.36 101.98 50.75 1.09 101.49 51.90 1.36 103.81
THC 50.64 3.35 101.27 53.83 3.91 107.66 51.28 1.92 102.56
Anandamide 50.65 2.35 100.30 50.55 2.34 100.07 50.14 1.98 99.27
2-AG 58.13 6.47 101.11 57.81 8.11 96.11 55.00 4.91 91.29
VEA 52.92 1.05 86.19 55.71 7.41 109.12 51.67 2.11 101.18
OEA 50.64 3.35 98.13 53.83 3.91 104.39 51.28 1.95 99.41
PEA 52.21 2.63 96.28 48.70 2.77 90.05 50.93 3.73 93.78
200 OH-THC 205.27 0.97 102.63 228.44 1.43 114.22 210.33 1.43 105.17
COOH-THC 208.68 1.07 104.35 204.64 1.14 102.33 216.06 0.86 107.86
CBD 211.56 0.77 105.78 205.55 1.20 102.77 211.28 0.37 105.64
THC 213.17 0.56 106.59 220.48 1.98 110.24 207.81 3.94 103.90
Anandamide 228.14 1.45 113.78 227.87 0.98 113.78 225.68 0.86 112.56
2-AG 247.13 0.73 119.10 241.70 2.27 115.01 235.65 1.19 112.08
VEA 203.30 0.86 101.11 198.99 0.78 98.97 194.01 0.17 96.49
OEA 227.13 0.79 112.66 221.70 2.48 109.99 215.65 1.29 106.98
PEA 231.97 1.98 113.59 223.25 8.09 109.39 231.56 4.36 113.34

Analyses were run on 3 consecutive days. The standard error of the mean was in all cases ≤20% and was omitted for clarity.

%RSD, percent relative standard deviation; EMR, Enhanced Matrix Removal.