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Lab Dept:
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Chemistry
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Test Name:
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THC CONFIRMATION, URINE
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General Information
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Lab Order Codes:
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THCON
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Synonyms:
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Cannabinoids Confirmation; Marijuana Confirmation; Hemp Confirmation; Mary Jane Confirmation; Reefer Confirmation; Roach Confirmation; Weed Confirmation
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CPT Codes:
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82541 - Column chromatography/mass spectrometry, analyte not elsewhere specified; qualitative single stationary and mobile phase
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Test Includes:
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Confirmation testing for THC metabolite at the care provider's request based on a positive screening found during Drugs of Abuse, Urine testing.
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Logistics
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Test Indications:
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Confirmation of positive screening test.
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Lab Testing Sections:
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Chemistry - Sendouts
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Referred to:
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MedTox Laboratories (Test# 312)
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Phone Numbers:
Minneapolis:
Saint Paul:
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612-813-6280
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651-220-6550
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Test Availability:
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Daily, 24 hours
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Turnaround Time:
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1 day or 4 hours, Stat
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Special Instructions:
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N/A
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Specimen
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Specimen Type:
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Urine
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Container:
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Urine cup
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Draw Volume:
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10 mL (Pediatric Minimum: 1.0 mL) urine
Note: Submission of the minimum volume results in an elevated reporting limit and inability to repeat analysis.
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Processed Volume:
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Same as Draw Volume
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Collection:
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Random urine
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Special Processing:
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Lab Staff: No preservative. Refrigerate specimen after collection. Centrifuge specimens containing particulates.
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Patient Preparation:
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None
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Sample Rejection:
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Unlabeled specimen, adulterated specimen, mislabeled specimen
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Interpretive
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Reference Range:
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Negative
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Critical Values:
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N/A
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Limitations:
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Reporting Limit: 15 ng/mL
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Methodology:
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Gas Chromatography Mass Spectrometry (gC/MS)
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References:
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MedTox Laboratories Web Page March 2009
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Updates:
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3/31/2009: CPT update, previously listed as 80102. Volume certification from MedTox (Noelle/Beth) for pediatric minimum.
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