Table. 6.

Number of participating laboratories with the percentage of results that were acceptable results in the proficiency test for drugs of abuse during 2019

Test substances % Range (2015–2018) During 2019

19-01 19-02 19-03 19-04
Methamphetamine 94.6–100 121 (99.2) 121 (99.2) 120 (98.3) 120 (98.3)
9-COOH-11-nor-△9-THC 94.6–100 110 (100) 110 (99.1) 110 (97.3) 110 (98.2)
Morphine, Free 96.6–100 111 (99.1) 111 (99.1) 110 (98.2) 110 (98.2)
Benzoylecgonine 95.9–100 102 (100) 102 (100) 103 (98.1) 103 (98.1)
d-Amphetamine 87.5–100 79 (100) 79 (97.5) 78 (97.4) 78 (98.7)
Methylenedioxymethamphetamine 84.0–100 60 (100) 60 (91.7) 62 (96.8) 62 (98.4)
Phencyclidine 100–100 22 (100) 22 (100) 22 (100) 22 (100)
Methadone 100–100 17 (100) 17 (100) 17 (100) 17 (100)
Nordiazepam 100–100 13 (100) 13 (100) 15 (100) 15 (100)
Oxazepam 100–100 15 (100) 15 (100) 15 (100) 15 (100)
3,4-Secobarbital 100–100 8 (100) 8 (100) 12 (100) 12 (100)
Nortriptyline 100–100 11 (100) 11 (100) 12 (100) 12 (100)
Ethanol 100–100 4 (100) 4 (100) 4 (100) 4 (100)
Propoxyphene 100–100 3 (100) 3 (100) 3 (100) 3 (100)
Lysergic acid diethylamide (LSD) 100–100 2 (100) 2 (100) 2 (100) 2 (100)

Values are presented as number (%).

J Lab Med Qual Assur 2020;42:183~193 https://doi.org/10.15263/jlmqa.2020.42.4.183
© Lab Med Qual Assur