Vitamin D Binding Protein (DBP) – Serum
This test measures the level of vitamin D binding protein, a protein in your blood that helps transport vitamin D and other fat-soluble vitamins.
["Understanding your vitamin D binding protein levels can help assess vitamin D metabolism and related health risks."]
Key facts at a glance
- LOINC
- 74415-1
- Short code
- RUBV IgG Fld Ql IA
- Synonyms
- RUBV IgG Fld Ql IA
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- ia
- CPT
- 82784
- 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 Is Vitamin D Binding Protein?
Vitamin D binding protein (DBP) is a carrier protein in your blood that binds to vitamin D and other fat-soluble vitamins, helping them stay in circulation. It also plays a role in transporting hormones and other molecules. This test helps evaluate how well your body is processing these substances.
Why Might You Need This Test?
Your doctor may order this test if you have symptoms related to vitamin D deficiency, kidney or liver conditions, or if you’re being monitored for conditions like hypercalcemia or certain metabolic disorders. It can also be part of broader evaluations for genetic disorders affecting protein function.
How Is the Test Performed?
A blood sample is drawn from a vein in your arm. The sample is then processed to separate serum (the liquid part after clotting) for analysis. The test measures the concentration of DBP in your blood using an immunoassay method, which detects the protein’s presence and quantity.
What Do the Results Mean?
Results are typically reported as a concentration value (e.g., grams per liter). While reference ranges can vary by lab, abnormal levels may suggest conditions like hypophosphatemia, kidney disease, or certain genetic disorders affecting protein metabolism.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Vitamin D binding protein levels can be important in diagnosing or monitoring conditions related to vitamin D metabolism, kidney function, or genetic disorders. For example, low levels may indicate kidney issues, while high levels could be associated with certain metabolic or hormonal imbalances. It’s often used alongside other tests to provide a clearer picture of your health.
Short name
DBP
Frequently asked questions
What causes abnormal vitamin D binding protein levels?
How long does it take to get results?
Can I eat or drink before this test?
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