Venlafaxine

Alphabetical Test listing

Venlafaxine-2394

Test name:

Venlafaxine

Test number:

2394

Excellian order number:

82492.03

Abbreviation:

VEN

Alternate names:

Desvenlafaxine
Effexor®
Pristiq®

Tests included:

Measures both Venlafaxine (Effexor) and
Venlafaxine metabolite (Desvenlafaxine), sold as Pristiq^®

Useful for:

Therapeutic drug management

Specimen type:

Serum

Collection container:

Red serum vial/tube - 5 mL

Volume:

3.0 mL

Minimum volume:

0.6 mL

Collection instructions:

Trough levels are the most reproducible

Processing instructions:

Allow sample to clot
Spin within two (2) hours of sample collection
Transfer serum to a Serum/plasma transfer vial/tube (MedTox), labelled as serum

Transport container:

Serum/plasma transfer vial/tube (MedTox)

Alternate specimen type:

Heparin plasma

Alternate collection container:

Dk green heparin (Li or Na), no gel

Alternate collection instructions:

Immediately following collection, mix sample thoroughly by gently inverting 5 - 10 times, to prevent clotting

Alternate processing instructions:

Spin within two (2) hours of sample collection
Transfer plasma to a Serum/plasma transfer vial/tube (MedTox) labelled as the appropriate plasma type

Transport and stability:

Refrigerated (preferred)

Ambient (OK) - 3 days

Frozen (OK)

Reason for rejection:

Gel-barrier tubes are not recommended

Performing lab:

MedTox Laboratories (179): R-MX

Days set up:

Tu, Fr

TAT:

3 - 4 days

Method:

Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)

Reference ranges:

Venlafaxine: 100 - 500 ng/mL

Desmethylvenlafaxine: 200 - 400 ng/mL

Results that require action (critical):

Not established

CPT codes:

G0480

Subject to medical necessity (Y/N):

Yes

LCD/NCD:

Medical necessity

Date created:

11/30/2001

Revised date:

12/27/2023

Review date:

12/27/2023