Table 3.

Linearity test.

Sample concentration	The value of T	The value of C	Characteristic value	Average value ($\stackrel{\_}{X}$)	Standard deviation (σ)	Coefficient of variation (CV)
100 ng/ml	13392	20244	0.661529362	0.698657612	0.032308661	0.046243913
	14896	20678	0.720379174
	18430	25810	0.7140643
10 ng/ml	2747	26454	0.103840627	0.115863316	0.015736094	0.135816017
	3928	29385	0.133673638
	3131	28444	0.110075684
1 ng/ml	442	35354	0.012502122	0.016030887	0.003334025	0.207975068
	595	36143	0.016462386
	613	32047	0.019128155