Table 2.

Storage conditions of fortified whole blood samples for stability study (n = 2)

Storage temperature	Preservative condition	Analysis time points (days)
RT	Unpreserved	0, 1, 2, 3, 7, 30, 90, 180
RT	2% NaF	0, 1, 2, 3, 7, 30, 90, 180
4 °C	Unpreserved	1, 2, 3, 7, 30, 90, 180
4 °C	2% NaF	1, 2, 3, 7, 30, 90, 180
− 20 °C	Unpreserved	1, 2, 3, 7, 30, 90, 180
− 20 °C	2% NaF	1, 2, 3, 7, 30, 90, 180
− 40 °C	Unpreserved	1, 2, 3, 7, 30, 90, 180
− 40 °C	2% NaF	1, 2, 3, 7, 30, 90, 180

RT room temperature