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

Specimen Required

Supplies: Urine Tubes, 10 mL (T068)

Collection Container/Tube: Plastic urine container

Submission Container/Tube: 10-mL 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.

Useful For

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

Profile Information

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

Method Name

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

CRETR: Enzymatic Colorimetric Assay

Reporting Name

THC-COOH/Creatinine Ratio, U

Specimen Type


Specimen Minimum Volume

6 mL

Specimen Stability Information

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

Reference Values

Carboxy-Tetrahydrocannabinol (THC):

Not Detected


Cutoff concentration:

Delta-9 Carboxy-tetrahydrocannabinol by liquid chromatography tandem mass spectrometry: <5.0 ng/mL



≥18 years old: 16-326 mg/dL

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

Day(s) Performed

Monday through Friday; Varies

Report Available

2 to 4 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

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

CPT Code Information



G0480, if appropriate

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


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