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Test Code THCMX 11-nor-Delta-9-Tetrahydrocannabinol-9-Carboxylic Acid (Carboxy-THC) Confirmation, Chain of Custody, Meconium

Useful For

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

 

Chain of custody is required whenever the results of testing could be used in a court of law. Its purpose is to protect the rights of the individual contributing the specimen by demonstrating that it was under the control of personnel involved with testing the specimen at all times; this control implies that the opportunity for specimen tampering would be limited. Since the evidence of illicit drug use during pregnancy can be cause for separating the baby from the mother, a complete chain of custody ensures that the test results are appropriate for legal proceedings.

Additional Tests

Test ID Reporting Name Available Separately Always Performed
COCH Chain of Custody Processing No Yes

Reporting Name

Carboxy-THC Confirmation, CoC, M

Specimen Type

Meconium


Specimen Required


Container/Tube: Chain-of-Custody Meconium Kit (T653) includes the specimen containers, seals, and documentation required.

Specimen Volume: 1 g (approximately 1 teaspoon)

Collection Instructions: Collect entire random meconium specimen.

Additional Information:

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

2. 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

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
THCMX Carboxy-THC Confirmation, CoC, M 69007-3

 

Result ID Test Result Name Result LOINC Value
36305 THC In Process
36306 Interpretation In Process
36307 Chain of Custody No LOINC Needed

Method Name

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