A Study on the Reliability of an On-Site Oral Fluid Drug Test in a Recreational Context

Table 3

Intraday () and interday () precision (measured as coefficient of variation, CV%) and accuracy (measured as % error) for analytes under investigation in oral fluid samples.

Analyte	Intraday precision			Intraday accuracy			Interday precision			Interday accuracy
	Low QC	Medium QC	High QC	Low QC	Medium QC	High QC	Low QC	Medium QC	High QC	Low QC	Medium QC	High QC
A	7.6	12.0	14.8	5.9	10.5	8.0	13.1	1.5	9.8	10.6	3.5	10.8
MA	14.8	3.1	11.7	6.4	9.3	7.4	10.2	7.8	4.4	10.4	9.7	8.0
MDA	5.3	8.2	5.9	6.2	10.3	11.6	9.6	2.4	8.8	10.5	8.5	9.4
Ketamine	9.2	7.1	9.5	4.3	11.1	10.3	8.5	7.4	10.1	10.1	8.8	10.3
MDMA	6.5	10.8	10.8	8.3	9.7	6.9	9.4	1.7	5.5	9.1	9.5	7.2
MDE	4.1	10.5	8.0	2.9	10.6	11.8	9.8	3.4	8.0	10.8	7.3	7.4
MBDB	10.6	5.1	9.4	3.4	10.4	10.7	11.5	12.3	7.4	12.2	10.6	10.2
Methadone	11.3	5.6	8.3	8.9	10.5	11.5	12.4	5.1	11.6	7.8	4.9	11.8
Cocaine	7.4	9.8	7.2	8.7	3.5	6.2	5.5	6.6	7.2	8.6	7.5	6.6
Cocaethylene	9.5	4.4	7.4	8.2	9.1	4.3	8.7	2.5	6.9	5.0	4.3	10.0
THC	11.8	8.8	10.2	5.9	10.8	8.0	10.2	1.6	11.8	4.8	5.2	8.7
Codeine	10.0	10.1	11.8	4.8	9.1	7.4	10.6	6.5	9.8	11.3	9.9	10.8
Morphine	6.5	7.8	10.1	5.3	7.8	11.6	13.1	3.5	4.4	6.8	3.5	10.8
6-MAM	6.2	8.0	10.0	1.9	8.6	9.8	10.2	7.4	8.8	9.9	9.7	8.0

A, amphetamine; MA, methamphetamine; MDA, 3,4-methylenedioxyamphetamine; MDMA, 3,4-methylenedioxymethamphetamine; MDEA, 3,4-methylenedioxy-N-ethylamphetamine; MBDB, N-methyl-1-(1,3-benzodioxol-5-yl)-2-butanamine; THC, ⁹-Tetrahydrocannabinol.