Table 3.

Extraction and ion suppression recovery data in human plasma

	Concentration (ng/ml)	Extraction Recovery		Ion Supression Relative Recovery
	(n=4)	Mean ± SD	CV (%)	Mean ± SD	CV (%)
17-OHPC	5	90.5 ± 1.5	1.7	101.6 ± 4.3	4.2
	25	89.2 ± 6.6	7.5	92.9 ± 5.0	5.4
	50	90.74± 0.9	1.0	98.6 ± 10.8	10.9
17-OHP	5	63.3 ± 2.1	3.3	89.9 ± 4.4	4.9
	25	61.4 ± 5.2	8.4	70.4 ± 7.4	10.5
	50	61.7 ± 5.3	8.6	78.6 ± 0.9	1.2
P	5	89.6 ± 4.9	5.5	106.6 ± 3.9	3.7
	25	91.5 ± 3.2	3.5	94.4 ± 2.9	3.0
	50	90.9 ± 4.2	4.7	98.9 ± 2.6	2.6
IS	25μl of 1μg/ml	95.7 ± 11.4	11.9	98.4 ± 6.0	5.9