Vitamin D Binding Protein (DBP) – Serum or Plasma Concentration
This test measures the level of a protein in your blood that helps transport vitamin D. It can be important for certain health assessments.
["This test helps evaluate how your body may handle vitamin D and related conditions."]
Key facts at a glance
- LOINC
- 31956-6
- Short code
- RUBV Ag Cvx Ql
- Synonyms
- RUBV Ag Cvx Ql
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- 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 Does This Test Measure?
Vitamin D Binding Protein (DBP) is a protein in your blood that binds to vitamin D and other fat-soluble vitamins. It helps transport these vitamins throughout your body. Your body produces this protein naturally, and its levels can be influenced by various health factors, including kidney function and genetic predispositions.
Why Might You Need This Test?
Doctors may order this test if you have symptoms or conditions linked to vitamin D metabolism, such as kidney disease, certain genetic disorders, or if you’re being monitored for vitamin D-related issues. It can also be part of broader evaluations for conditions affecting vitamin metabolism.
How Is This Test Performed?
A blood sample is taken from a vein, usually in your arm. The sample is then sent to a lab where it is analyzed using an immunoassay or similar method to measure the concentration of Vitamin D Binding Protein.
What Are Possible Results?
Results are typically reported as a concentration value (e.g., in grams per liter). While reference ranges can vary by lab, abnormal levels may suggest underlying health concerns that need further evaluation.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Vitamin D Binding Protein levels can be relevant in diagnosing or monitoring conditions like nephrotic syndrome, certain genetic disorders (e.g., vitamin D-dependent rickets), or kidney dysfunction. It may also be used in research or specialized clinical scenarios where vitamin D metabolism is a focus.
Short name
Vitamin D Binding Protein
Frequently asked questions
What does a low or high Vitamin D Binding Protein level mean?
The frequency depends on your medical condition and why the test was ordered. Your healthcare provider will determine the best timing based on your individual needs.
The blood draw itself may cause a slight pinch or discomfort, but it is generally brief and well-tolerated. Most people experience minimal discomfort afterward.
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