Cannabinoids Confirmation, Urine (Sendout)

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General Information

Lab Name
Cannabinoids Confirmation, Urine (Sendout)
Lab Code
RUTHC
Epic Name
Cannabinoids Confirmation, Urine (Sendout)
External Test Id
THCU
Description

Useful For: Detection and confirmation of drug use of cannabis/marijuana in urine samples. This test identifies and quantifies delta-8-THC-COOH and delta-9-THC-COOH.

Ordering Guidance: Available as a reflex confirmation test only. Refer to Drug Testing for Chronic Prescription of Controlled Substances for available panels.

References
Synonyms
Cannabinoids, Carboxy-THC Confirmation, Marijuana, Tetrahydrocannabinol, THC, THCU
Components
Code Name
RUD8TH Delta 8 Carboxy THC
RUD9TH Delta 9 Carboxy THC
RUTHCI Carboxy THC Interpretation

Interpretation

Method

Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS)

Reference Range
See individual components
Ref. Range Notes

Reference Values: Not Detected

Cutoff Concentrations:

Delta-8 Carboxy-Tetrahydrocannabinol (THC): < 5.0 ng/mL
Delta-9 Carboxy-Tetrahydrocannabinol (THC): < 5.0 ng/mL

Interpretation:

The presence of delta-8 and/or delta-9 carboxy tetrahydrocannabinol (THC-COOH) in urine is a strong indicator that the patient has used cannabis/marijuana.

THC-COOH has a long half-life and can be detected in urine for more than 7 days after a single use.

Chronic use causes accumulation of THC and THC-COOH in adipose tissue, such that it is excreted into the urine for as long as 30 to 60 days from the time chronic use is halted.

References

Ordering & Collection

Specimen Type
Urine
Collection

Collect Random Urine in a preservative-free urine collection container.

Handling Instructions

Outside Laboratories: Aliquot 0.5 to 3 mL urine into a separate plastic vial. Refrigerate urine.

Stability: Refrigerated (preferred): 14 days; Frozen: 14 days; Ambient: 72 hours.

Reject Due To: Gross icterus.

Quantity
Requested: 3 mL urine
Minimum: 0.5 mL urine

Processing

Receiving Instructions

Aliquot 0.5 mL to 3 mL urine into a separate screw-cap vial. Refrigerate urine.

Sendouts:

  • Order Mayo Test: THCU
  • Interfaced: Yes [Interface: 601; Department: MARF]

Stability: Refrigerated (preferred): 14 days; Frozen: 14 days; Ambient: 72 hours.

Reject Due To: Gross icterus.

Misc Sendout

Performance

Lab Department
Sendouts Mayo Lab (RF)(MARF)
Frequency
Performed: Monday through Friday. Report Available: 3-5 days from sample receipt at Mayo Clinic Labs.
Available STAT?
No
Performing Location(s)
Sendout Mayo Clinic Laboratories (Superior Drive)
800-533-1710

3050 Superior Drive NW
Rochester, MN 55901

Billing & Coding

CPT Codes
G0480
LOINC
20521-1
Interfaced Order Code
UOW4700