Specimen Requirements


Venlafaxine and Metabolite, Serum or Plasma

Specimen Requirement

Patient prepartion:
Draw immediately before next scheduled dose. Also appropriate is drawing 12 hours after an oral dose.

Collect red top or lavender EDTA, centrifuge and transfer 1.0 mL serum/plasma to a screw top plastic vial within 2 hours of collection, indicate sample type on tube and send.


Quantitative Liquid Chromatography/Tandem Mass Spectrometry


Room temp: 14 days, Refrigerated: 14 days, Frozen: 14 days

Reference Range

The reference range is determined by the performing laboratory and will show on the report.


3-10 days performed Wednesday, Saturday

Clinical Use

Test Code