Venlafaxine (Effexor)

Test ID: 

704018

CPT code:

80338

Synonyms:

Venlafaxine and Desmethylvenlafaxine, Serum or Plasma

Effexor®

Clinical Use:

Therapeutic drug management

Specimen Type:

Serum or plasma

Requested Volume: 

3 mL

Minimum Volume: 

0.6 mL

Container Type: 

Red-top tube or green-top (heparin) tube. Gel-barrier tubes are not recommended.

Patient Preparation: 

Trough levels are most reproducible.

Collection:

Serum or plasma should be separated from cells within two hours of venipuncture. Submit serum or plasma in a plastic transport tube.

Storage Instructions:

Submission/transport (<3 days): Room temperature.

Stability Requirements:

For storage beyond three days, specimen should be refrigerated or frozen.

Rejection Criteria

Gel-barrier tubes