Dopamine Metabolite Ratio (Vmax/VpUSM) in Plasma
This test measures the ratio of two dopamine-related substances in your blood, which may help assess dopamine activity or function in your body.
["This ratio can provide insights into how dopamine is processed in your system, potentially linked to certain health conditions."]
Key facts at a glance
- LOINC
- 81398-0
- Short code
- MV E-wave Vmax/Vp US.M-mode+DOP.A4C
- Synonyms
- MV E-wave Vmax/Vp US.M-mode+DOP.A4C
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- us-m-mode-doppler-a-c
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
What This Test Measures
The test evaluates the ratio of **dopamine metabolites** (specifically, a processed form of dopamine) in your plasma. It compares the concentration of these metabolites at different time points or conditions, often related to how dopamine is metabolized or transported in your body.
Why It Might Be Ordered
Your healthcare provider may order this test if you have symptoms or conditions associated with dopamine dysfunction, such as certain neurological disorders, or if you’re being evaluated for a metabolic or endocrine issue. It may also be used in research or specialized clinical settings to monitor dopamine-related pathways.
Common Conditions Monitored
While not a standard diagnostic test for most conditions, this ratio could be part of a broader evaluation for disorders involving dopamine imbalance, such as Parkinson’s disease, certain psychiatric conditions, or metabolic disorders. It’s important to discuss the specific reason for testing with your doctor.
What to Expect Before the Test
No special preparation is typically required, but you may be asked to fast or avoid certain medications for a set period before your blood draw. Follow your healthcare provider’s instructions carefully.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test is not widely used in routine clinical practice but may offer valuable insights in specialized cases. Abnormal ratios could indicate dysfunction in dopamine metabolism, which may relate to neurological, metabolic, or endocrine disorders. Always interpret results in the context of your overall health and medical history with your provider.
Short name
Dopamine Metabolite Ratio
Frequently asked questions
Why might my doctor want to check this test?
What do the results mean?
Is this test painful or uncomfortable?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy