Table 3.

Limits of quantitation (LOQ, S/N = 10) of DS and IS products.

	DS LOQ (pg/ml)		IS LOQ (pg/ml)
	FS	tSIM	FS	tSIM
E1	5.6	4.4	1.2	0.4
E2	2.5	1.7	0.4	0.03
E3	3.8	4.3	2.8	1.2
16epi-E3	5.5	4.4	2.7	1.4
17epi-E3	4.4	4	3.1	1.4
16OH-E1	8	4.9	4.7	0.6
16keto-E2	6	4.4	3.2	0.4
2OH-E1	100	2.9	3.2	0.7
4OH-E1	100	2.5	3.4	0.9
2OMe-E1	7.4	4.9	3.5	2.1
2OH-E2	50	50	1.7	0.6
4OH-E2	50	100	7.6	2.2
2OMe-E2	4.4	1.7	1.3	0.2
4OMe-E2	6	2.1	2.2	0.2

ND: not determined.