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Test Code THCM 11-nor-Delta-9-Tetrahydrocannabinol-9-Carboxylic Acid (Carboxy-THC) Confirmation, Meconium

Reporting Name

Carboxy-THC Confirmation, M

Useful For

Detecting in utero drug exposure to marijuana (tetrahydrocannabinol) up to 5 months before birth

Method Name

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

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Specimen Type

Meconium


Ordering Guidance


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

Reject Due To

Grossly bloody Reject; Pink OK
Stool
Diapers		 Reject

Reference Values

Negative

Positives are reported with a quantitative liquid chromatography tandem mass spectrometry result.

Cutoff concentration: 5 ng/g

Day(s) Performed

Monday through Sunday

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 Carboxy-THC 69007-3
31876 Interpretation 69050-3
31877 Chain of Custody 77202-0

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.

Report Available

2 to 3 days

Forms

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