Find Locations
For hours, walk-ins and appointments.Test Includes
Cannabinoids (THC); creatinine; cannabinoid:creatinine ratio
Expected Turnaround Time
3 - 5 days
Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.
Related Information
Related Documents
Specimen Requirements
Specimen
Urine (random)
Volume
5 mL
Minimum Volume
1.4 mL
Container
Plastic transport tube or plastic urine container
Storage Instructions
Room temperature
Stability Requirements
Temperature | Period |
|---|---|
Room temperature | 7 days |
Refrigerated | 14 days |
Frozen | 14 days |
Freeze/thaw cycles | Stable x3 |
Test Details
Use
Cannabinoid concentration is normalized using creatinine to correct for diurnal fluctuations in fluid intake and urine output. The normalized cannabinoid concentration can be used to monitor compliance with drug treatment programs. Serial determinations should be done at two- to three-day intervals. A 50% increase over the previous result is strong indication of continued marijuana use.
Methodology
Immunoassay
LOINC® Map
| Order Code | Order Code Name | Order Loinc | Result Code | Result Code Name | UofM | Result LOINC |
|---|---|---|---|---|---|---|
| 070409 | Cannabinoid/Creatinine Ratio | 070410 | Cannabinoids Quant, Urine | ng/mL | 19073-6 | |
| 070409 | Cannabinoid/Creatinine Ratio | 075003 | Creatinine, Urine | mg/mL | 2161-8 | |
| 070409 | Cannabinoid/Creatinine Ratio | 075004 | Cannab/Crt Ratio | ng/mg creat | 13478-3 |
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The LOINC® codes are copyright © 1994-2021, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee. Permission is granted in perpetuity, without payment of license fees or royalties, to use, copy, or distribute the LOINC® codes for any commercial or non-commercial purpose, subject to the terms under the license agreement found at https://loinc.org/license/. Additional information regarding LOINC® codes can be found at LOINC.org, including the LOINC Manual, which can be downloaded at LOINC.org/downloads/files/LOINCManual.pdf