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HelpTest Code COKEM Cocaine and Metabolites Confirmation, Meconium
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Specimen Type
MeconiumOrdering 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 |
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
Day(s) Performed
Monday through Sunday
CPT Code Information
80353
G0480 (if appropriate)
Report Available
2 to 3 daysReject Due To
| Grossly bloody | Reject; Pink OK |
| Stool Diapers |
Reject |
Method Name
Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS)
Forms
If not ordering electronically, complete, print, and send a Therapeutics Test Request (T831) with the specimen.