Venlafaxine & Metabolite
Test Mnemonic
VENLA
CPT Codes
- 80299 - QTY (1)
Aliases
- Effexor
Includes
- Venlafaxine
- O-desmethylvenlafaxine
- Venlafaxine + O-desmethylvenlafaxine Total
Performing Laboratory
Mayo Clinic Dpt of Lab Med & Pathology
Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 1 mL | Serum | No additive (Red) | Refrigerated | Do not use serum separator tubes. Separate serum from cells within 2 hours of collection. |
Minimum Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 0.4 mL |
Stability
| Environmental Condition | Description |
|---|---|
| Ambient | 28 days |
| Refrigerated | 28 days |
| Frozen | 28 days |
Days Performed
Thu
Turnaround Time
2 - 5 days
Methodology
| Name | Description |
|---|---|
| Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS) |
Reference Range
| Venlafaxine & O-desmethylvenlafaxine | |||||
|---|---|---|---|---|---|
| Sex | Age From | Age To | Type | Range | Range Unit |
| Normal | 100 - 400 | ng/mL |
Special Info
Do not use serum separator tubes. Separate serum from cells within 2 hours of collection. This test is New York DOH approved.
Clinical Info
This test is useful for monitoring serum concentration during therapy, evaluating potential toxicity, and evaluating patient compliance. Draw blood immediately prior to next scheduled dose. Blood drawn from patients 12 hours after an oral dose is also appropriate. It is customary to treat the patient at bedtime with a dose, then collect specimen the following morning prior to next dose.