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MARIJUANA CONFIRMATION, URINE

Mnemonic

_CM THC2

Synonym

Cannabinoids - THCA - 11-nor-Δ-9-tetrahydorcannabinol-9-carboxylic acid - Δ-9-THC-COOH

Includes

Reported as Marijuana metabolite-THCA

Specimen Collection Requirements

Collect

Urine in a sterile container

Handling

Refrigerate (2-8°C) if unable to deliver to the lab within 3 days.

Preferred Volume

10 mL

Minimum Volume

5 mL

Transport

Ambient (20-25°C)

Rejection Criteria

If minimum specimen volume is not received, testing will not be performed.

Stability

Ambient (20-25°C): 3 days; Refrigerated (2-8°C): 10 days; Frozen (< -10°C): 1 year

Testing Information

Performed

Tue - Sat

Reported

1-2 days

Method

Gas Chromatography Mass Spectrometry

Reference Values

Reference Values

THCA: Not Detected < 3 ng/mL

Comments

Drugs of Abuse Detection Times and Drug Metabolites

THCA normalization to urine creatinine is available upon request. This calculation is useful for monitoring patients with Marijuana abuse syndrome. Monitor THCA/Creatinine normalized values in urine at least once per week to help assess abstinence vs. continued use.

THCA is the primary metabolite of THC (delta-9-tetrahydrocannabinol, marijuana's major psychoactive ingredient). This test cannot differentiate between prescribed (e.g. Marinol), medical marijuana, or illicit forms of marijuana. This test cannot distinguish between active or passive marijuana exposure, or if the patient is under the influence of marijuana at the time of the specimen collection.

CPT Codes

80349

Last Updated: Friday, April 21, 2017 11:23:15 AM


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