Update Type: Test Down or Delayed
Test Updated: 12/20/2023
Test Overview
Test Methodology
Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
Test Usage
Therapeutic Drug Monitoring
Test Limitations
Methadone has a wide therapeutic index and dose-dependent toxicity. As a result, routine drug monitoring is not indicated in all patients.
Test Details
Days Set Up
Tuesday, Thursday, Sunday
Analytic Time
4 - 6 days
Soft Order Code
MDNS
MiChart Code
Methadone, Serum (Sendout)
Synonyms
- MTDNS
- Methadone, Serum
- MDNS
Laboratory
Sendout
Reference Laboratory
Mayo MDNS
Section
Special Testing
Specimen Requirements
Collection
SST not acceptable
Collection Instructions
Collect specimen in a red top tube (no SST). Centrifuge within 2 hours, aliquot serum into a plastic vial and refrigerate.
Normal Volume
0.5 mL serum
Additional Information
Test sent to Mayo Medical Laboratories.
Billing
CPT Code
80358
Fee Code
22016