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cannabis (cannabinoids, THC) in the urine

Name cannabis (cannabinoids, THC) in the urine
Specimen requirements 10 ml of urine
Procedure remarks detects urine metabolites delta-9-tetrahydrocannabinol carboxylic acid (delta-9 THC)
Methodology GC-MS (gas chromatography mass spectrometry)
Reference ranges < 25 µg/l,
Detection limit: 5.0 µg/l
Diagnostic recommendation determined as THC - carboxylic acid
Remarks Testing currently takes place in a contract laboratory