Table 2.

Intra-assay and inter-assay coefficients of variation of samples with high, medium or low cortisol concentrations

Sample concentration	Intra-assay CV			Inter-assay CV
	Mean μg/dl	SD	CV %	Mean μg/dl	SD	CV %
High	3.23	0.16	5.0	3.42	0.20	5.9
Medium	2.25	0.04	1.8	1.96	0.29	14.8
Low	0.55	0.01	1.8	0.48	0.06	13.0