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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. DBP helps transport vitamin D and other hormones in your bloodstream.

Quick summary

["DBP levels may be checked if you have symptoms of vitamin D deficiency or related conditions."]

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

Key facts at a glance

LOINC
81431-9
Short code
Reg deg AV Angio
Synonyms
Reg deg AV Angio
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
angiography
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 recommend this test if you have symptoms like fatigue, bone pain, or muscle weakness, which could be linked to vitamin D metabolism. It may also be part of a broader evaluation for conditions affecting protein function in the blood, such as kidney disease or certain genetic disorders.

What to Expect Before the Test

No special preparation is usually needed. You may be asked to fast for 8–12 hours before the blood draw, but this depends on your provider’s instructions. Bring any medications you’re taking to your appointment.

What the Test Involves

A healthcare professional will draw blood from a vein in your arm. The blood sample will be sent to a lab for analysis using an immunoassay method to detect DBP levels.

What the Results Mean

Results are typically reported as a concentration of DBP in the blood. While reference ranges vary by lab, abnormal levels may suggest conditions like kidney disease or genetic disorders affecting protein function.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

DBP

Frequently asked questions

Could my vitamin D levels be checked at the same time?
Yes, some labs offer combined tests for Vitamin D Binding Protein and vitamin D levels. Ask your provider if they can assess both together during your visit.
What does it mean if my DBP levels are low?
Low DBP levels may signal kidney problems or genetic disorders affecting protein metabolism. Your provider will review your full clinical picture to determine next steps, such as further testing or monitoring.
Do I need to avoid certain foods before this test?
No specific diet restrictions apply, but follow your provider’s instructions regarding fasting if they recommend it. Avoiding alcohol or certain medications (like blood thinners) may also be advised, so check with them.
  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