Nominal concentration (µg/mL)
Found concentration (µg/mL)
Precisiona (RSD)
Accuracy (%)
Intra-assay (n = 5)
LQC (0.75)
Day 1
0.74
6.06
99.20
Day 2
0.75
5.75
100.53
Day 3
9.79
100.27
MQC (1.50)
1.53
4.30
101.67
1.60
7.41
106.83
1.48
1.40
98.50
HQC (3.00)
3.14
3.11
104.53
3.21
1.95
107.13
3.00
7.25
99.92
Inter-assay (n = 15)
LQC
0.77
100.44
MQC
3.98
102.22
HQC
3.12
3.43
103.89