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DL METHAMPHETAMINE ISOMERS CONFIRMATION, URINE

Mnemonic

U M DLMETH

Synonym

DL Meth - DL Methamphetamine Isomers - Stereoisomers (enantiomer) Analysis - Methamphetamine DL - Meth DL

Guidelines

This test is orderable after obtaining a Positive Urine Methamphetamine confirmation. This DL Methamphetamine isomer is used to definitely determine if the patient has been exposed to the DEA controlled drug: D Methamphetamine.

Specimen Collection Requirements

Collect

Urine, in a sterile container

Preferred Volume

10 mL

Minimum Volume

4 mL

Transport

Refrigerated (2-8°C)

Rejection Criteria

Confirmation may not be performed if specimen volume is less than minimum.

Testing Information

Performed

Mon - Sat

Reported

2-3 days

Method

GC/MS

Reference Values

Reference Values

D Methamphetamine < 20%

Comments

D L Methamphetamine Interpretation.

Methamphetamine comes in two isomers. One isomer called Dextro, or D Methamphetamine, is active as a central nervous system stimulant and it is a DEA Schedule 2 controlled drug commonly called “Meth” or “Speed”. Desoxyn, a prescription drug also contains D Methamphetamine.

The other isomer, Levo, or L Methamphetamine is not a DEA controlled drug. It is found in an over the counter medicine called “Vicks Inhaler” or as the prescription drug, Selegiline. In addition to some medications, L Methamphetamine can be produced in the illegal production of street Methamphetamine. For this reason federal drug testing policies have determined that urine containing 20% or more D Methamphetamine is consistent with exposure to the DEA Schedule 2 version of Methamphetamine- D Methamphetamine.

Standard GCMS confirmations do not distinguish between these two forms of Methamphetamine. This DL Methamphetamine isomer test provides specific information regarding the % of D Methamphetamine in the specimen by separating and measuring both the L and D versions of Methamphetamine. Results are reported as the %D found in the specimen. A 0% D result means that the sample was 100% L Methamphetamine. A 20% D Methamphetamine result means that the sample had 80% L Methamphetamine.

CPT Codes

80374

Last Updated: Tuesday, March 7, 2017 10:26:04 AM


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