Table 1.

Intra-day and inter-day accuracies and precisions as well as extraction recoveries for S-adenosylmethionine and S-adenosylhomocysteine.

Analyte	Quality control concentration	Intra-day accuracy ± coefficient of variation	Inter-day accuracy ± coefficient of variation	Recovery ± coefficient of variation
	nmol/L	[%]	[%]	[%]
SAM	37.5	93.4 ± 6.6	96.5 ± 9.2	99.7 ± 7.2
	75	96.6 ± 5.3	99.3 ± 8.6	99.8 ± 2.4
	150	91.9 ± 4.4	97.4 ± 8.9	99.2 ± 2.1
	300	105.5 ± 2.4	101.5 ± 8.7	104.6 ± 3.0
	900	98.9 ± 7.1	103.9 ± 8.1	103.3 ± 2.2
SAH	37.5	95.0 ± 8.1	98.9 ± 8.7	96.7 ± 5.8
	75	90.3 ± 4.3	99.3 ± 9.6	95.4 ± 2.3
	150	89.7 ± 3.0	97.9 ± 9.8	92.7 ± 3.4
	300	98.5 ± 5.3	99.0 ± 9.7	97.1 ± 1.1
	900	90.3 ± 2.5	98.9 ± 8.4	103.5 ± 4.4