Test Code THCM 11-nor-Delta-9-Tetrahydrocannabinol-9-Carboxylic Acid (Carboxy-THC) Confirmation, Meconium
Reporting Name
Carboxy-THC Confirmation, MUseful For
Detection of in utero drug exposure to marijuana (tetrahydrocannabinol) up to 5 months before birth
Performing Laboratory

Specimen Type
MeconiumAdvisory Information
For chain-of-custody testing, order THCMX / 11-nor-Delta-9-Tetrahydrocannabinol-9-Carboxylic Acid (Carboxy-THC) Confirmation, Chain of Custody, Meconium.
Specimen Required
Supplies: Stool container, Small (Random), 4 oz (T288)
Container/Tube: Stool container
Specimen Volume: 1 g (approximately 1 teaspoon)
Collection Instructions: Collect entire random meconium specimen.
Specimen Minimum Volume
0.3 g (approximately 1/4 teaspoon)
Specimen Stability Information
Specimen Type | Temperature | Time | Special Container |
---|---|---|---|
Meconium | Frozen (preferred) | 28 days | |
Refrigerated | 21 days | ||
Ambient | 14 days |
Reference Values
Negative
Positives are reported with a quantitative LC-MS/MS result.
Cutoff concentrations
Tetrahydrocannabinol carboxylic acid (marijuana metabolite) by LC-MS/MS: 10 ng/g
Day(s) and Time(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. This test has not been cleared or approved by the U.S. Food and Drug Administration.CPT Code Information
80349
G0480 (if appropriate)
LOINC Code Information
Test ID | Test Order Name | Order LOINC Value |
---|---|---|
THCM | Carboxy-THC Confirmation, M | 69007-3 |
Result ID | Test Result Name | Result LOINC Value |
---|---|---|
31863 | THC | 69007-3 |
31876 | Interpretation | 69050-3 |
31877 | Chain of Custody | 77202-0 |
Reject Due To
Grossly bloody | Reject; Pink OK |
Stool Diapers | Reject |
Method Name
Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
Forms
If not ordering electronically, complete, print, and send a Therapeutics Test Request (T831) with the specimen.