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

Useful For

Detection of in utero drug exposure up to 5 months before birth

Method Name

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

Reporting Name

Carboxy-THC Confirmation, M

Specimen Type

Meconium

Specimen Required

Chain of custody is recommended for this test. Chain-of-Custody Meconium Kit (T653) is available upon request.

 

Container/Tube: Stool container (T288)

Specimen Volume: 1 g (approximately 1 teaspoon)

Collection Instructions: Collect entire random meconium specimen.

Additional Information:

1. For chain-of-custody information, see Chain-of-Custody Meconium Kit (T653).

2. Specimen that arrives with a broken seal does not meet the chain-of-custody requirements.

3. The laboratory recommends sending chain-of-custody specimens by overnight shipment.

Forms: Chain-of-Custody Request Form is included in the Chain-of-Custody Kit (T653). A copy of this form is also available at http://www.mayomedicallaboratories.com/it-mmfiles/chain-of-custody-request-form.pdf.

Specimen Minimum Volume

0.3 g (approximately 1/4 teaspoon)

Specimen Stability Information

Specimen Type Temperature Time
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 Friday, Sunday; Varies

Performing Laboratory

Mayo Medical Laboratories in Rochester

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 No LOINC Needed

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.