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Vitamin D Binding Protein (DBP) – Serum 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 in your body.

Quick summary

["Understanding your DBP levels can help assess how well your body processes vitamin D and related substances."]

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

Key facts at a glance

LOINC
73978-9
Short code
vWf:Ac PPP IA-aCnc
Synonyms
vWf:Ac PPP IA-aCnc
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

What Is Vitamin D Binding Protein?

Vitamin D Binding Protein (DBP) is a protein in your blood that binds to vitamin D and other hormones, helping them travel through your circulatory system. It plays a role in regulating hormone activity and maintaining balance in your body.

Why Might You Need This Test?

Your healthcare provider may order this test if you have symptoms related to hormone imbalances, kidney or liver conditions, or if you’re being evaluated for conditions affecting vitamin D metabolism.

How Is the Test Performed?

A blood sample is taken from a vein in your arm. The blood is then processed to measure the concentration of DBP in your serum.

What Do Results Mean?

Results provide insight into your body’s ability to transport and regulate certain hormones, though specific reference ranges vary by lab and clinical context.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

DBP Level

Frequently asked questions

What causes abnormal DBP levels?
Abnormal DBP levels may be linked to kidney or liver disease, genetic conditions, or certain medications that affect protein production or metabolism.
How often should I get this test?
The frequency depends on your healthcare provider’s recommendations. Some patients may need it annually or as part of routine monitoring for chronic conditions.
Can diet or lifestyle affect DBP levels?
Dietary factors like vitamin D intake or overall nutrition may indirectly influence hormone-related proteins, but DBP itself is not directly affected by 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