Posted Date
Effective Date
Test Name
Methadone and Metabolites, Serum
Update Type
Reference range changed
CPT Code
80358
Order Code
MDNS
Methadone and Metabolites, Serum
Order Code: MDNS
Fee Code: 22016 (CPT 80358)
Reference Laboratory: Mayo MDNS
The following clarifying language and cut off values will be added to the reference range for Mayo Clinic Laboratories Methadone and Metabolites, Serum assay effective May 27, 2025:
Reference Range:
Methadone: Therapeutic: 100-400 ng/mL, Toxic: >2000 ng/mL
EDDP: Not established
Cutoff concentrations by liquid chromatography tandem mass spectrometry:
Methadone: 10 ng/mL
EDDP: 5.0 ng/mL