Doxepin

Test Code
826


CPT Codes
80299

Includes
Doxepin, Nordoxepin and Total


Preferred Specimen
3 mL serum collected in a red-top tube (no gel)


Minimum Volume
1.5 mL


Other Acceptable Specimens
Plasma collected in an: EDTA (lavender-top) tube, or sodium heparin (green-top) tube, or lithium heparin (green-top) tube


Instructions
Collect at steady-state trough concentration Specimen should be collected > 12 hours after dose.


Transport Temperature
Room temperature


Specimen Stability
Room temperature: 5 days
Refrigerated: 7 days
Frozen: 30 days


Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis • Serum separator tubes (SST)


Methodology
Chromatography/Mass Spectrometry

FDA Status
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by the FDA. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.

Setup Schedule
Set up: Mon-Sat; Report available: Next day


Reference Range
Total 110-250 mcg/L


Clinical Significance
Doxepin is a tricyclic antidepressant. Therapeutic drug levels are monitored to assist the physician assessing therapeutic response and to avoid toxicity.




The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.