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Test ID THCCR Delta 9-Carboxy-Tetrahydrocannabinol (THC-COOH) Confirmation and Creatinine Ratio, Random, Urine

Method Name

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

CRETR: Enzymatic Colorimetric Assay


Specimen Required


Supplies: Urine Tubes, 10 mL (T068)

Collection Container/Tube: Plastic urine container

Submission Container/Tube: 10-mL urine tube

Specimen Volume: 10 mL

Collection Instructions:

1. Collect a random urine specimen.

2. Submit 10 mL in a plastic container.

3. No preservative.

Additional Information:

1. No specimen substitutions.

2. Submitting less than 10 mL may compromise the ability to perform all necessary testing.

3. STAT requests are not accepted for this test.


Reporting Name

THC-COOH/Creatinine Ratio, U

Specimen Type

Urine

Specimen Stability Information

Specimen Type Temperature Time
Urine Refrigerated (preferred) 14 days
  Frozen  14 days
  Ambient  72 hours

Report Available

2 to 4 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

LOINC Code Information

Test ID Test Order Name Order LOINC Value
THCCR THC-COOH/Creatinine Ratio, U 19055-3

 

Result ID Test Result Name Result LOINC Value
CRETR Creatinine, Random, U 2161-8
616334 Delta-9 Carboxy-Tetrahydrocannabinol by LC-MS/MS 20521-1
616335 Carboxy-THC Interpretation 69050-3
616336 THC-COOH/Creatinine Ratio 19055-3

Forms

If not ordering electronically, complete, print, and send a Therapeutics Test Request (T831) with the specimen.

Useful For

Measuring the delta-9 carboxy-tetrahydrocannabinol to creatinine ratio to detect use of tetrahydrocannabinol

Day(s) Performed

Monday through Sunday

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.

CPT Code Information

G0480

82570 (if appropriate for select payers)

80349 (if appropriate for select payers)

Clinical Toxicology CPT Code Client Guidance

Profile Information

Test ID Reporting Name Available Separately Always Performed
THCCU THC-COOH/Creatinine Ratio, U No Yes
CRETR Creatinine, Random, U No Yes

Specimen Minimum Volume

6 mL

Reference Values

CARBOXY-TETRAHYDROCANNABINOL (THC):

Not Detected (Positive result is reported with a quantitative result.)

 

Cutoff concentration by liquid chromatography tandem mass spectrometry:

DELTA-9 CARBOXY-TETRAHYDROCANNABINOL: 5.0 ng/mL

 

CREATININE:

≥18 years old: 16-326 mg/dL

Reference values have not been established for patients who are younger than 18 years.