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Test Code U THC SC Urine THC Screen

Important Note

This test is a screen only. Confirmation testing is available, but cannot be done stat. The assay of marijuana metabolites in urine is useful only as an indication of exposure to cannabinoids and not as a measure of active use or intoxication. Samples are stable refrigerated for up to 24 hours.

Clinical System Name

Urine THC Screen


Marijuana Screen
Urine THC Screen

Urine THC Qualitative

THC Qual, Urine

Sample Requirements

Specimen: Urine

Container(s): Leak-Proof Container

Preferred Vol: 5 mL

Minimum Vol:


Note: Random urine

Processing Instructions

Reject due to:

Spin: N


Temp: -20 C

Storage location: Transfer 5 mL urine to a plastic Falcon tube affixed with a large computer label and freeze in the CPA freezer.


Off-site collection:


Specimen Type Temperature Time
Urine Room temp  N
  Refrigerated  24 h
  Frozen  Y



STAT Performed TAT
Y Daily 1 d


Performing Laboratory

Harborview Medical Center



Harborview Medical Center

Room GWH47; 325 9th Ave
Seattle, WA 98104

Phone Number: (206) 744-3451


Reference Range

Negative for marijuana metabolites.


Method: EMIT

Analytical Volume: 0.5 mL urine


CPT Codes

CPT Code: 80301

G Code: G0479


Send Out Instructions


Reference Test Name: Cannabinoids, Qualitative Urine
Reference Test Number: UTHCQL
Instructions: This test is available stat; see protocol for stat sendouts. If ordered routine, send out Mon - Fri with the UW/HMC courier. Keep a copy of the Batch Sheet for our records.