A Human Oral Fluid Assay for D- and L- Isomer Detection of Amphetamine and Methamphetamine Using Liquid-Liquid Extraction

Table 5

Interassay precision and accuracy: precision and accuracy over 3 days with replicates of 6 for a total of 18 samples.

Drug/Metabolite	LLOQ		LQC		MQC		HQC
	%CV	%E	%CV	%E	%CV	%E	%CV	%E
Amphetamine	9.25	7.37	4.31	11.13	4.22	−3.09	8.02	0.30
Methamphetamine	8.52	2.81	3.34	0.69	4.42	−2.40	4.66	2.08
D-amphetamine	3.95	13.09	4.54	10.70	1.80	−1.52	3.55	4.47
L-amphetamine	4.12	10.00	3.04	11.52	2.07	−1.85	2.94	−2.81
D-methamphetamine	4.44	3.17	3.98	1.30	4.04	0.21	4.89	11.05
L-methamphetamine	5.54	3.21	4.98	2.33	5.32	0.52	5.07	12.66

Indicates combined D- and L-.