Table 5.

Stability of DBV at different storage conditions. In our study, we tested both the extracts and the plasma samples (according to routine needs).

Quality Control		Low	Medium	High
Types of Sample	Tested Conditions	Avg Accuracy (Bias%)	Avg Accuracy (Bias%)	Avg Accuracy (Bias%)
extract	autosampler post 24 h	22.1	9.4	14.8
	freezer post 24 h	16.8	6.7	12.3
plasma samples	freeze-thaw stability
	1 cycle	14.8	8.2	11.4
	2 cycle	15.1	9.3	13.6
	3 cycle	17.4	15.7	16.4