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Test Code LAB2003 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.

Additional Codes

U THC SC

Clinical System Name

Urine THC Screen

Sample Requirements

Specimen: Urine

Container(s): Leak-Proof Container

Preferred Vol: 5.0 mL

Minimum Vol: 0.5 mL

 

Note: Collect random urine.

Processing Instructions

Reject due to:

Spin: N

Aliquot: N

Temp: -20 C

Storage Location: Transfer 5.0 mL urine (Min. 0.5 mL) to a plastic Falcon tube affixed with a large Epic label and freeze in CPA -20 C freezer.

 

Off-site Collection: Freeze at -20 C and transport frozen.

Stability

Specimen Type Temperature Time
Urine Room Temp  Unacceptable
  Refrigerated  24 h
  Frozen  Indefinite

 

Performing Laboratory

Harborview Medical Center

Chemistry (CHH)

325 9th Ave, Room GWH47
Seattle, WA 98104

 

Phone Number: (206) 744-3451

Department

Department: Send Outs

Phone Number: (206) 987-2563

Synonyms

Cannabinoids

Hashish Urine
Marijuana Screen

Marijuana Urine

Tetrahydrocannabinol Urine

THC Urine
Urine THC Screen

Urine THC Qualitative

THC Qual, Urine

Availability

STAT Performed TAT
Y Daily 1 d

 

Methodology

Method: Enzyme Multiplied Immunoassay Technique (EMIT)

Analytical Volume: 0.5 mL Urine

Limitations:

Reference Range

Female Male
Age Range Age Range
0- Negative 0- Negative

 

Note: Negative Cutoff limit: THC 50 ng/mL. GC Mass Spec Confirmation not performed.

CPT Codes

80307

 

Send Out Instructions

Reference Test Name: Cannabinoids Qualitative, Urine
Reference Lab Test Code: UTHCQL
Instructions: Send Monday through Friday with the UW courier. For STAT requests, see STAT send out policy.