Vitamin D binding protein (DBP) concentration, serum/plasma
This test measures the level of a protein in your blood that helps transport vitamin D. It’s often checked alongside vitamin D levels to assess overall vitamin D status and metabolism.
["This test helps doctors evaluate how your body processes vitamin D and may support diagnosis of related conditions like vitamin D deficiency or disorders of vitamin D metabolism."]
Key facts at a glance
- LOINC
- 43397-9
- Short code
- dRVVT imm NP PPP
- Synonyms
- dRVVT imm NP PPP
- Category
- chemistry
- Sample
- plasma
- Container
- Lavender-top (EDTA) or Green-top (Heparin)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- coag-dilute-russell-viper-venom-induced-factor-substitution-immediately-after-addition-of-normal-plasma
- 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
Why This Test Matters in Your Health
Vitamin D binding protein (DBP) plays a key role in transporting vitamin D through your bloodstream. While vitamin D itself is crucial for bone health and immune function, DBP ensures it’s available where needed. Your doctor may order this test if they suspect vitamin D deficiency, kidney or liver issues, or genetic disorders affecting vitamin D metabolism.
What to Expect Before the Test
No special preparation is needed for this test. You’ll have a small needle inserted into your arm or vein to draw blood. If you’re nervous, let your healthcare provider know—they can offer comfort measures. Avoid alcohol for 24 hours before testing if instructed, as it may affect blood composition.
Common Reasons for This Test
Doctors may order this test if you have symptoms like fatigue, bone pain, or frequent infections, which could signal vitamin D deficiency or related conditions. It’s also used in research or monitoring certain genetic disorders. Your doctor will discuss the reason with you before ordering it.
What the Results Mean
Results help assess how well your body is using vitamin D. High levels may indicate overproduction or certain genetic conditions, while low levels could suggest vitamin D deficiency or kidney/liver problems. Your doctor will interpret results in the context of your overall health and symptoms.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
Vitamin D Binding Protein
Frequently asked questions
How often should I get this test?
Does this test affect my vitamin D levels?
Can I eat or drink anything before the blood draw?
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