. 2016 Jun 27;31(1):e22021. doi: 10.1002/jcla.22021

Table 5.

Precision and Accuracy of Quality Controls

Immunoassay	MPA	Target concentration [ng/ml]			Precision (RSD %)					Accuracy (bias, %)
	MPA	Target concentration [ng/ml]			Intra‐day			Inter‐day		Intra‐day			Inter‐day
	Cut‐off	Low	Middle	High	Low	Middle	High	Low	High	Low	Middle	High	Low	High
Cannabinoids	10	9.4	12.5	16	2.4	1.0	0.9	5.2	5.1	−1	13	1	−12	0
Opiates	25	28	37.5	47	2.0	1.4	1.4	6.0	3.5	2	4	7	1	7
Cocaine (metabolite)	30	28	37.5	47	1.1	2.9	1.5	3.1	3.2	18	17	25	15	21
Amphetamine	50	20	25	50	3.8	6.5	2.5	9.9	6.6	13	10	11	10	8
Methamphetamine	50	28	37.5	47	4.4	6.4	4.3	5.3	4.5	25	26	32	17	23
Ecstasy	50	37.5	50	75	7.6	1.5	0.7	4.4	3.3	−19	3	2	−21	−2
EDDP	50	37.5	50	75	6.1	4.1	2.8	11	3.6	3	−8	7	10	11
Benzodiazepines	50	38	50	63	2.4	2.3	3.5	4.7	4.5a	3	0	1	16	13a
Ethyl glucuronide	100	75	100	375	4.8	4.5	0.9	9.7	2.0	−7	3	−6	−1	−6

N = 4.