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Vitamin D Binding Protein (DBP) – Serum or Plasma Concentration

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of Vitamin D Binding Protein in your blood, which helps transport vitamin D and other hormones. It may be checked alongside vitamin D levels to assess overall vitamin D metabolism.

Quick summary

["Your DBP levels help doctors understand how well your body processes vitamin D and other related substances."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
74809-5
Short code
vWf:Ac Act/Nor PPP Cont IA
Synonyms
vWf:Ac Act/Nor PPP Cont IA
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
ia
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 Might Be Ordered

Your healthcare provider may order this test if they suspect conditions affecting vitamin D metabolism, such as kidney disease, liver disease, or certain genetic disorders. It could also be part of a broader evaluation for symptoms like fatigue, bone pain, or unexplained muscle weakness.

What to Expect Before the Test

No special preparation is needed. You may have a blood draw from a vein in your arm. If you’re taking certain medications or have a history of bleeding disorders, let your provider know beforehand.

What the Results Mean

While DBP levels alone don’t directly indicate vitamin D status, they can be part of a larger picture. High levels might suggest conditions like nephrotic syndrome or certain liver issues, while very low levels could be linked to kidney problems or genetic disorders.

Common Conditions Monitored

This test is often used alongside vitamin D levels to diagnose or monitor conditions like chronic kidney disease, liver disease, or hereditary disorders affecting protein metabolism.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: DBP’s Role in Health

Short name

DBP Level

Frequently asked questions

How long will it take to get my results?
Results are typically available within 1–3 business days, depending on your lab’s processing time. Your healthcare provider will discuss them with you during your follow-up visit.
Can I eat or drink before this test?
You can eat and drink normally before the test, as it’s a blood draw. Avoiding food or fluids for a specific period isn’t required.
Does this test interact with my medications?
Some medications, like certain blood thinners or steroids, may affect protein levels. Always inform your provider about all medications or supplements you’re taking.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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