A positive cannabinoids workplace drug test following the ingestion of commercially available hemp seed oil.
A commercially available health food product of cold-pressed hemp seed oil ingested by one volunteer twice a day for 4 1/2 days (135 mL total). Urine specimens collected from the volunteer were subjected to standard workplace urine drug testing procedures, and the following concentrations of 11-nor-delta9- tetrahydrocannabinol carboxylic acid (9-THCA) were detected: 41 ng/mL 9-THCA at 45 h, 49 ng/mL at 69 h, and 55 ng/mL at 93 h. Ingestion was discontinued after 93 h, and the following concentrations were detected: 68 ng/mL at 108 h, 57 ng/mL at 117 h, 31 ng/mL at 126 h, and 20 ng/mL at 142 h. The first specimen that tested negative (50 ng/mL initial immunoassay test, 15 ng/mL confirmatory gas chromatographic-mass spectrometric test) was at 146 h, which was 53 h after the last hemp seed oil ingestion. Four subsequent specimens taken to 177 h were also negative. This study indicates that a workplace urine drug test positive for cannabinoids may arise from the consumption of commercially available cold-pressed hemp seed oil.
Struempler
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ARUP Laboratories, Inc., Salt Lake City, Utah 84108, USA.
Nelson
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Urry
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D016477:Artifacts; D002186:Cannabinoids / Q000652:urine*; D002188:Cannabis; D004042:Dietary Fats, Unsaturated / Q000652:urine*; D013759:Dronabinol / Q000031:analogs & derivatives* / Q000652:urine; D006801:Humans; D008297:Male; D008875:Middle Aged; D016272:Occupational Health; D010938:Plant Oils; D012016:Reference Values; D012639:Seeds
D002186:Cannabinoids; D004042:Dietary Fats, Unsaturated; D010938:Plant Oils; C016780:11-nor-delta(9)-tetrahydrocannabinol-9-carboxylic acid; D013759:Dronabinol