Label Mnemonic: THCU
Epic code: LAB5203
Downtime form: A-1a Doctor/Provider Orders - Pathology Core and Specialty Care Nursery
6240 RCP
Urine Screen, Random
Collection Medium:
Clear top tube
Alternate Collection Media:
Urine (Random)-BD Vacutainer®, no additive yellow top
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:
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).
Screen includes THC with a cutoff of 50 ng/mL for the main 
metabolite of THC (9-carboxy-THC).

If confirmation is needed for THC, call the Laboratory at 356-3527.  
Allow up to seven days for confirmatory results.  Confirmation is at 
an additional charge.

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.


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 

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.
Assay is based on the kinetic interaction of microparticles in a solution (KIMS) as measured by changes in light transmission.
CPT Code:
See also:
Drugs of Abuse, Urine
Drugs of Abuse, Urine + Confirm
THC, Urine Screen + Reflexed Confirmation, Random