Optimize drug therapy and monitor patient adherence.
Quantitative Liquid Chromatography-Tandem Mass Spectrometry
Mon, Wed, Fri
New York DOH Approval Status
Timing of specimen collection: Pre-dose (trough) draw - At steady state concentration.
Plain red. Also acceptable: Lavender (K2 or K3EDTA) or pink (K2EDTA).
Separate serum or plasma from cells within 2 hours of collection. Transfer 1 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.5 mL)
Whole blood. Gel separator tubes, light blue (citrate), or yellow (SPS or ACD solution).
After separation from cells: Ambient: 5 days; Refrigerated: 2 weeks; Frozen: 6 months
Effective February 19, 2013
|Therapeutic Range||Total (doxepin and nordoxepin): 100-300 ng/mL|
|Toxic Level||Greater than 500 ng/mL|
Toxic concentrations may cause anticholinergic effects and cardiac abnormalities.
This test was developed and its performance characteristics determined by ARUP Laboratories. It has not been cleared or approved by the US Food and Drug Administration. This test was performed in a CLIA certified laboratory and is intended for clinical purposes.
Laboratory Developed Test (LDT)
80335 (Alt code: G0480)
|Component Test Code*||Component Chart Name||LOINC|
|0090101||Doxepin/Nordoxepin Total, SP||3582-4|