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Vitamin D Binding Protein (DBP) – Serum

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

This test measures the level of Vitamin D Binding Protein (DBP) in your blood serum. DBP helps transport vitamin D in your body and may be checked if you have symptoms related to vitamin D metabolism or certain medical conditions.

Quick summary

["DBP levels may help assess vitamin D transport and related health risks."]

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

Key facts at a glance

LOINC
14215-8
Short code
HTLV I g46 Ab Ser Ql
Synonyms
HTLV I g46 Ab Ser 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

Why This Test Might Be Ordered

Your healthcare provider may order this test if you have symptoms like bone pain, muscle weakness, or if they suspect conditions affecting vitamin D metabolism, such as kidney disease or certain genetic disorders. It may also be part of broader evaluations for vitamin D deficiency or disorders like porphyria or hereditary angioedema.

What to Expect Before the Test

No special preparation is needed for this blood test. You may have a small needle inserted into your arm to draw blood, and you’ll rest for a few minutes afterward. If you’re on blood thinners, let your provider know before the test.

What the Results Mean

While specific reference ranges can vary by lab, abnormal DBP levels may indicate conditions affecting protein synthesis, transport, or kidney function. High levels might suggest certain genetic disorders, while low levels could be linked to kidney disease or other metabolic issues.

Common Conditions Linked to DBP Levels

Elevated DBP levels may be associated with hereditary angioedema or porphyria, while low levels could relate to kidney dysfunction or conditions affecting protein production in the liver.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

DBP

Frequently asked questions

What causes DBP levels to be checked?
Your doctor may order this test if you have symptoms like unexplained bone pain, muscle weakness, or if they suspect genetic disorders (e.g., hereditary angioedema) or kidney disease.
How long does it take to get results?
Results are typically available within 1–3 business days, depending on your lab and healthcare provider’s workflow.
Can diet affect DBP levels?
Dietary vitamin D intake may indirectly influence vitamin D metabolism, but DBP itself is a protein, so its levels are more tied to genetic, kidney, or liver function rather than diet alone.
  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