Table 2.

Comparison of Mass Spectrometry and ELISA with Postmenopausal Serum Samples

Serum Sample	E2 (pg/mlc)		E1 (pg/mlc)		T (pg/mlc)
	MSa	ELISAb	MSa	ELISAb	MSa	ELISAb
1	82.5 ± 2.1	67	58.6 ± 2.6	73	422.5 ± 14	431
2	<3	<11.8	7.9 ± 0.4	49	143.9 ± 8.0	100
3	<3	<11.8	8.8 ± 0.6	67	132.7 ± 5.2	130
4	<3	ND	9.8 ± 0.6	48	137.3 ± 7.5	218
5	4.1 ± 0.6	<11.8	6.9 ± 0.3	29	62.4 ± 2.8	109
6	7.5 ± 0.7	<11.8	45.0 ± 1.3	67	63.3 ± 2.8	18

^aConcentration as determined by mass spectrometry, n = 5.

^bAverage concentration as determined by ELISA, n = 2.

^cTo convert E2 (pg/ml) to pM, multiply by 3.67, E1: 3.72, T: 3.47.