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

Table 3

Statistical analysis for each analyte standard curve over three assays.

Drug/Metabolite	Curve range (ng/mL)	Mean R	RSD	Mean slope	SD slope	N	Fit
Amphetamine	5–1000	0.9990	0.0006	0.0594	0.0037	3.0000	Quadratic
Methamphetamine	5–2000	0.9999	0.0001	0.0104	0.0004	3.0000	Quadratic
D-amphetamine	2.5–1000	0.9994	0.0003	0.0104	0.0010	3.0000	Quadratic
L-amphetamine	2.5–1000	0.9993	0.0006	0.0105	0.0010	3.0000	Quadratic
D-methamphetamine	2.5–1000	0.9995	0.0008	0.0218	0.0021	3.0000	Quadratic
L-methamphetamine	2.5–1000	0.9985	0.0021	0.0246	0.0031	3.0000	Quadratic

Indicates combined D- and L-.