Table 4.

Stability of GPC1 at low, mid, and high QC levels in 1% BSA under different conditions.

QC levels	Statistics	GPC1
72 h 4 °C processed-sample reinjection
	n	6
Low	RSD (%)	0.0
	Accuracy (%)	100.0
	n	6
Mid	RSD (%)	4.0
	Accuracy (%)	101.7
	n	6
High	RSD (%)	3.3
	Accuracy (%)	98.7
Three freeze/thaw matrix stability
	n	6
Low	RSD (%)	9.8
	Accuracy (%)	83.3
	n	6
Mid	RSD (%)	0.0
	Accuracy (%)	90.0
	n	6
High	RSD (%)	3.6
	Accuracy (%)	94.0
48 h room temperature matrix stability
	n	6
Low	RSD (%)	14.4
	Accuracy (%)	56.7
	n	6
Mid	RSD (%)	8.4
	Accuracy (%)	48.3
	n	6
High	RSD (%)	9.8
	Accuracy (%)	50.0