Table 2. Intra-day and inter-day precision (CV%) and accuracy (bias) values.

Concentration (μM)	Intra-day precision (CV%)	Intra-day accuracy (bias)	Inter-day precision (CV%)	Inter-day accuracy (bias)
0.1	7.97	1.14	12.34	−9.87
1	8.71	−7.31	10.43	−11.28
10	1.3	0.83	1.59	2.98