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Test Code LAB1232209 11-nor-Delta-9-Tetrahydrocannabinol-9-Carboxylic Acid (Carboxy-THC) Confirmation, Meconium

Important Note

Mayo code is THCM

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Reporting Name

Carboxy-THC Confirmation, M

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.


Reject Due To

Grossly bloody Reject; Pink OK
Stool;
Diapers		 Reject

Specimen Stability Information

Specimen Type Temperature Time
Meconium Frozen (preferred) 28 days
  Refrigerated  21 days
  Ambient  14 days

Specimen Minimum Volume

0.3 g (approximately 1/4 teaspoon)

Day(s) Performed

Monday through Sunday

Specimen Retention Time

2 weeks

Report Available

2 to 3 days

Reference Values

Negative

 

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

 

Cutoff concentration: 5 ng/g

Useful For

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

CPT Code Information

G0480

80349 (if appropriate for select payers)

Clinical Toxicology CPT Code Client Guidance

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

Method Description

Meconium is mixed with internal standard and extracted with methanol. The methanolic extract is further processed by solid phase extraction. The extract is analyzed by liquid chromatography tandem mass spectroscopy.(Unpublished Mayo method)

Forms

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