. 2019 Aug 26;9:12370. doi: 10.1038/s41598-019-48876-w

Table 2.

The slope and correlation coefficient of the calibration curves in a water sample and in different blood matrices using deuterated internal standard correction.

	TMAO		Betaine		Choline		Carnitine		GBB
	Slope	R²	Slope	R²	Slope	R²	Slope	R²	Slope	R²
Water	0.20	0.998	0.031	0.999	0.11	0.999	0.052	0.998	0.71	0.998
Heparin	0.19	0.998	0.030	0.998	0.11	1.000	0.050	0.999	0.74	0.993
EDTA	0.19	0.993	0.033	0.999	0.12	0.999	0.054	0.999	0.73	0.997
Citrate	0.19	0.999	0.032	1.000	0.11	0.998	0.049	0.999	0.72	1.000
Serum	0.21	0.998	0.030	0.997	0.11	1.000	0.053	0.999	0.72	0.999
RSD of slopes (%)	3.1		3.4		3.2		3.2		1.6