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Vitamin D Binding Protein (DBP) Immunoassay, 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 and other hormones in your bloodstream.

Quick summary

["DBP levels can provide insight into how 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
69949-6
Short code
EBV VCA IgG Avidity Ser Ql IA
Synonyms
EBV VCA IgG Avidity Ser Ql IA
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
CPT
82784
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 Does This Test Measure?

Vitamin D Binding Protein (DBP) is a protein in your blood that binds to vitamin D and other hormones, helping them stay in circulation. This test specifically measures the concentration of DBP in your serum sample.

Why Might You Need This Test?

Your healthcare provider may order this test if they suspect issues related to vitamin D metabolism, kidney function, or hormone regulation. It can also be part of broader evaluations for conditions affecting protein binding in the blood.

Sample Collection and Preparation

A blood sample is drawn from a vein, typically in your arm. The blood is then processed to separate the serum (the liquid part after clotting). This serum is used for testing.

What Does a High or Low Level Mean?

While specific interpretations depend on clinical context, abnormal levels of DBP can sometimes indicate underlying health conditions. For example, certain genetic disorders or kidney problems may affect DBP levels.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Vitamin D Binding Protein (DBP) Test

Frequently asked questions

What causes changes in DBP levels?
Changes in DBP levels can be influenced by genetic factors, kidney disease, liver disease, or certain medications. It can also be part of broader metabolic evaluations, especially when vitamin D or hormone-related issues are suspected.
How is this test different from a vitamin D test?
This test specifically measures the DBP protein itself, which helps transport vitamin D and other substances. A vitamin D test measures the actual vitamin D levels in your blood, not the protein that carries it.
Is this test painful?
The blood draw for this test involves a small needle inserted into your arm, which may cause a brief sting or discomfort. Most people find it temporary and manageable. Your healthcare provider will explain the process and provide any necessary precautions.
  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