Table 8. . Stability studies of LB-100 and endothall under various conditions.

Analyte		Stability recoveries, % (mean ± SD)
		Auto-sampler (4°C, 24 h)	Benchtop (RT, 24 h)	Long-term (-20°C, 60 days)	Freeze–thaw (-20°C after three cycles)
LB-100	Plasma LQC	102 ± 1	100 ± 2	106 ± 4	104 ± 2
	Plasma HQC	97 ± 2	104 ± 4	92 ± 2	92 ± 4
Endothall	Plasma LQC	96 ± 1	103 ± 5	102 ± 5	106 ± 6
	Plasma HQC	91 ± 3	103 ± 3	99 ± 2	100 ± 5

HQC: High-concentration quality control; LQC: Low-concentration quality control; RT: Room temperature; SD: Standard deviation.