THC
| Label Mnemonic: | THCR |
| Epic code: | LAB7388 |
| Order form: | Laboratory Requisition |
| Supply order: | Supply Order Form |
| Billing: | Billing Policies |
| CPT code: | 80349 |
Specimen(s):
Urine Screen + Reflexed Confirmation, Random
Collection Medium:
)
|
| Clear top tube |
Alternate Collection Media:
Urine (Random)-BD Vacutainer®, no additive yellow top
Minimum:
5 mL random urine
Rejection Criteria:
Test cannot be added to a urine sample previously utilized for
urinalysis testing (LAB1160, LAB1164, LAB8379).
Testing Schedule:
24 hrs/day, 7 days a week, including holidays.
Turn Around Time:
1 hour (upon receipt in laboratory)
Reference Range:
None
Interpretive Data:
Drug of abuse screening tests are to be used for medical purposes
only and not for non-medical purposes (e.g., employee, competitive
athlete, or forensic testing).
Comments:
Screen includes THC with a cutoff of 50 ng/mL for the main metabolite of THC (9-carboxy-THC). All positive screening tests are automatically reflexed to a mail-out confirmation assay that uses liquid chromatography-tandem mass spectrometry (LC/MS/MS) to provide definitive identification and quantitation of 9-carboxy-THC. It is highly unlikely that passive (second-hand) inhalation of marijuana smoke will result in a positive screening test. Research studies have shown that maximum urinary concentrations of 9-carboxy- THC levels only reach 15-20 ng/mL following passive inhalation of heavy marijuana smoke. References: Cone EJ, Johnson RE, Darwin WD, Yousefnejad D, Mell LD, Paul BD, Mitchell J. Passive inhalation of marijuana smoke: urinarlysis and room air levels of delta-9-tetrahydrocannabinol. J Anal Toxicol 1987;11:89-96. Hammett-Stabler CA, Pesce AJ, Cannon DJ. Urine Drug Screening in the Medical Setting. Clinica Chimica Acta 2002;315:125-135.
Test Limitations:
There is the possibility that other substances and/or factors may
interfere with the test and cause erroneous results (e.g., technical
or procedural errors). Call the lab at 319-356-3527 for additional
information.
Methodology:
Assay is based on the kinetic interaction of microparticles in a
solution (KIMS) as measured by changes in light transmission.
Sample Processing:
Submit urine in leak-proof plastic container.
Label the container with two Full patient identifiers, start date/time, and stop date/time of collection.
Label the container with two Full patient identifiers, start date/time, and stop date/time of collection.
Sample Storage:
Refrigerate.
Transport Instructions:
Place labeled specimen into zip-lock type biohazard bag; seal
bag.
Place completed requisition into outside pocket of bag.
Transport in cooler with refrigerated coolant packs.
Place completed requisition into outside pocket of bag.
Transport in cooler with refrigerated coolant packs.