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Test performed at:

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Doxepin (DesmethyDoxepin, nordoxepin, Sinequan)

Test Name

Doxepin (DesmethyDoxepin, nordoxepin, Sinequan)

Red Tube with thin top Specimen Type/Requirements

Container Type = 1 Red Top

Minimum Volume = 3 mL Blood

Tube must fill to at least ½ or greater of its vacuum capacity

Specimen Handling

Collection Instructions: Serum collected in red top without gel separator. Submit trough specimen collected 1 h prior to the next dose or at least 12 h after the last dose. Assay includes Nordoxepin Write your initials, date and time of collection on the collection label or requisition.

Laboratory Staff Instructions: Separate samples from cells as soon as possible. Repeated freezing and thawing of samples should be avoided.

Rejection Criteria: Unlabeled or samples of non sufficient quantity.

Stability: Separated from cells stable for 5 days at room temperature, refrigerated 2 weeks, frozen 6 months.

Transportation: Send sample to core lab as soon as possible.

Required Documentation

Turnaround Time (TAT)

7 days (batched)

Test Utilization

Reference Value

Combined Metabolite: 0.35-1.10 umol/L

Toxic: > 1.40 umol/L

Test Code




Testing Location


Other Information

Last Updated: November 07, 2019