Methadone

Synonyms

EDDP

Expected Turnaround Time

24 Hours

Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.

Specimen Requirements

Specimen

Clean Catch Urine

Volume

10 ml

Minimum Volume

1 ml

Container

Sterile Urine transport tube

Storage Instructions

Refrigerated (2-8 C)

Stability Requirements

Room temp. 7 days, Refrigerated 7 days

Causes for Rejection

mislabeled specimen, leaked specimen, no patient identifier, QNS

Test Details

Use

Metabolite (EDDP) (MetMtb) assay is for in vitro diagnostic use in the qualitative determination of methadone metabolite in human urine.

Methodology

Homogenous Enzyme Immunoassay

Reference Interval

Negative

Additional Information

Methadone is a long-acting synthetic opioid used for both pain management and opioid use disorder (OUD). It acts as a full agonist at the mu-opioid receptor and also possesses NMDA receptor antagonistic properties, which may contribute to its efficacy in treating neuropathic pain. Unlike shorter-acting opioids, methadone has a long and variable half-life (ranging from 8 to 59 hours), allowing for once-daily dosing in maintenance therapy. This pharmacokinetic profile helps reduce opioid cravings and withdrawal symptoms in individuals undergoing treatment for addiction.

Clinically, methadone is tightly regulated due to its potential for respiratory depression, cardiac arrhythmias (notably QT prolongation), and accumulation with repeated dosing. Careful dose titration and ECG monitoring are recommended, especially in patients with cardiac risk factors. Methadone is metabolized by CYP3A4, CYP2B6, and CYP2D6 enzymes, making it susceptible to significant drug-drug interactions. In addiction treatment programs, methadone is dispensed in federally licensed opioid treatment programs (OTPs), whereas pain management use requires vigilant monitoring to avoid misuse or overdose.

Reference:
Kreek, M. J., & Vocci, F. J. (2002). History and current status of opioid maintenance treatments: blending conference session. Drug and Alcohol Dependence, 70(2), S5–S15. https://doi.org/10.1016/S0376-8716(03)00054-8

Footnotes

Statement on Medical Necessity
All ordered tests should be medically necessary for the diagnosis or detection of disease, illness, impairment, symptom, syndrome, or disorder and the results should be used in the medical management and treatment decisions for the patient. Solaris requires ICD-10 codes with each order for lab testing and both the tests ordered and the diagnosis should be documented in the provider’s medical record for the patient. The United States Department of Health and Human Services, Office of Inspector General, takes the position that a provider who orders medically unnecessary tests may be subject to civil penalties.

Panels and Profiles
Solaris offers Providers the convenience of ordering test combinations in a group at times with the flexibility to choose appropriate test(s) for individual patients. Providers should only order those tests that he or she believes are medically necessary for each patient, and a lesser inclusive profile or individual tests should be ordered if not all tests in the test combination/profile are medically necessary. All tests offered in a test combination/profile may be ordered separately as individual tests. Solaris encourages clients to contact their Solaris representative if the testing configurations shown do not meet individual needs for any reason, or if some other combination of procedures is needed.

CPT Codes
CPT Codes listed are in accordance with Current Procedural Terminology, a publication of the American Medical Association. CPT codes are the responsibility of the billing party and are listed here for informational purposes. Correct coding may vary from one carrier to another. Solaris may bill specific carriers using codes other than what is shown.

Questions?

For questions or inquiries related to testing please reach out to
customerservice@solarisdx.com or contact us by phone at (844) 550-0308.