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Venlafaxine and Metabolite

Effexor®

Test Codes

ARUP: Order as a Miscellaneous Send Out, Beaker: XMISC

Department

Send Outs

Specimen Collection Criteria

Collect (preferred specimen): One plain Red-top tube.
Also acceptable: One Lavender-top EDTA tube.

Do not use Serum Separator Tubes.

Physician Office/Draw Specimen Preparation

Centrifuge to separate serum or plasma from cells within two hours collection. Transfer serum or plasma to a plastic transport tube and refrigerate (2-8°C or 36-46°F).

Preparation for Courier Transport

Transport: 1.0 mL serum or plasma, refrigerated (2-8°C or 36-46°F). (Minimum: 0.5 mL)

Rejection Criteria

• Serum Separator (SST) tubes.
• Specimens not collected and processed as indicated.

In-Lab Processing

Centrifuge to separate serum or plasma from cells within two hours collection. Transfer serum or plasma to a plastic transport tube and refrigerate (2-8°C or 36-46°F).

Transport: 1.0 mL serum or plasma, refrigerated (2-8°C or 36-46°F). (Minimum: 0.5 mL)

Storage

Specimen Stability for Testing:

Room Temperature (20-26°C or 68-78.8°F): 14 days
Refrigerated (2-8°C or 36-46°F): 14 days
Frozen (-20°C/-4°F or below): 14 days

Specimen Storage in Department Prior to Disposal:

Specimen retention time is determined by the policy of the reference laboratory. Contact the Send Outs Laboratory with any questions.

Laboratory

Sent to ARUP Laboratories, Salt Lake City, UT.

Performed

Sunday, Wednesday.
Results available in 2-8 days.

Reference Range

Therapeutic Range: 195-400 ng/mL (total - venlafaxine and o-desmethylvenlafaxine).
Toxic Range: Not well established.

Test Methodology

Quantitative Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS).

Interpretation

By report.

Clinical Utility

Effexor (venlafaxine hydrochloride) is an antidepressant for oral administration. It is indicated for the treatment of depression. This assay is used for the therapeutic monitoring and toxicity assessment of venlafaxine.

CPT Codes

80338 alt G0480.

Contacts

Last Updated

7/21/2024