Table 3.

Stability of QCs and calibrators during ten freeze-thaw cycles and storage at temperatures of 4, 22, and 60 °C for up to 24 hours (n=3).

	HGA (%Recovery)*			MCPG (%Recovery)*
	QH	QM	QL	QH	QM	QL
4 °C	101	89.6	96.5	107	90.8	97.3
22 °C	94.2	102	86.1	106	104	98.8
Freeze Thaw	105	128	122	109	134	121
	S8	S5	S2	S8	S5	S2
60 °C	92.6	95.6	99.9	95.4	98.4	105

^*%Recovery, ( $\%\mathit{Recovery}=\frac{{\mathit{Conc}}_2}{{\mathit{Conc}}_1}\times 100\%$)