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Test Code LAB0293784 Cocaine and Metabolites Confirmation, Meconium

Additional Codes

 

Mayo Test ID
COKEM

 

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Useful For

Detecting in utero drug exposure up to 5 months before birth

Method Name

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

Reporting Name

Cocaine and Metabolites, Confirm, M

Specimen Type

Meconium


Ordering Guidance


For chain-of-custody testing, order COKMX / Cocaine and Metabolite 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) 21 days
  Refrigerated  21 days
  Ambient  72 hours

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 (LC-MS/MS) result.

Cutoff concentrations for LC-MS/MS testing:

Cocaine: 20 ng/g

Benzoylecgonine: 20 ng/g

Cocaethylene: 20 ng/g

m-Hydroxybenzoylecgonine: 20 ng/g

Interpretation

The presence of any of the following: cocaine, benzoylecgonine, cocaethylene, or m-hydroxybenzoylecgonine, at 20 ng/g or more, is indicative of in utero drug exposure up to 5 months before birth.

Day(s) Performed

Monday through Sunday

Report Available

2 to 3 days

Specimen Retention Time

2 weeks

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.

CPT Code Information

80353

G0480 (if appropriate)

LOINC Code Information

Test ID Test Order Name Order LOINC Value
COKEM Cocaine and Metabolites, Confirm, M 69008-1

 

Result ID Test Result Name Result LOINC Value
31859 Cocaine 69009-9
31860 Benzoylecgonine 69010-7
31861 Cocaethylene 69011-5
31862 m-Hydroxybenzoylecgonine 69012-3
31864 Interpretation 69050-3
31865 Chain of Custody 77202-0

Forms

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