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Item Value
Approval req'd? No
Available Stat? No
Test code DOX
Test group Doxepin
Performed by Quest
Sendout? Yes
Method Liquid Chromatography Tandem Mass Spectrometry
Collection Instructions Do not use Gold top.

Optimum time to collect is 10-14 hours after oral dose.
Container type Red top
Amount to Collect 6 mL blood
Sample type Serum
Preferred volume 3 mL serum
Min. Volume 1.5 mL serum
UCSF Rejection Criteria Collected in Gold top, hemolysis.
Processing notes Refrigerate.
Units µg/L (mcg/L)
Normal range Therapeutic: 150-250 µg/L for SUM of Doxepin and Nordeoxepin
Critical value Quest Priority-1: Doxepin + Nordoxepin ≥ 600 µg/L
Synonyms Adapin; Sinequan
Stability Room temperature 5 days, refrigerated 1 week, frozen at -20C 1 month
Turn around times Test run 3x per week. Turnaround time 3-5 days
Additional information Assay measures both parent and nordoxepin metabolite. Potentially toxic: > 500 for the SUM of the two compounds. See also Drug Screening.
CPT coding 80166-90
LOINC code 3579-0
Last Updated 7/31/2012 12:52:33 PM
Entry Number 321
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