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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 substances in your bloodstream.

Quick summary

["DBP levels may affect how vitamin D and other hormones are transported in your body."]

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

Key facts at a glance

LOINC
81643-9
Short code
vWf:RCo/vWF Ag PPP-Rto
Synonyms
vWf:RCo/vWF Ag PPP-Rto
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
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 DBP Measure?

Vitamin D Binding Protein (DBP) is a protein found in your blood that binds to and transports various substances, including vitamin D. It helps maintain the balance of these substances by keeping them in circulation and making them available for use by your body’s cells.

Why Might Your Doctor Order This Test?

Your doctor may order this test if they suspect an issue with how your body processes or transports certain hormones, vitamins, or other substances. It could also be part of a broader evaluation for conditions related to vitamin D metabolism or kidney function.

How Is This Test Performed?

A blood sample is drawn from a vein in your arm. The sample is then sent to a lab where it is analyzed to measure the concentration of Vitamin D Binding Protein.

What Are Possible Results?

Results are typically reported as a concentration level of DBP in the blood, though specific reference ranges can vary by lab. Your results will be interpreted by your healthcare provider in the context of your overall health and medical history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Elevated levels of DBP may be associated with certain genetic conditions or kidney-related disorders. Lower levels might be seen in conditions affecting protein synthesis or transport mechanisms in the body. While DBP itself is not directly linked to common diseases like vitamin D deficiency, it can sometimes be part of a broader assessment for metabolic or endocrine disorders.

Short name

DBP

Frequently asked questions

What does a high or low DBP level mean?
A high DBP level could suggest conditions like nephrotic syndrome or certain genetic disorders affecting protein metabolism. A low DBP level may indicate potential issues with protein synthesis or could be part of a broader evaluation if other symptoms or lab findings are present.
How often should I get this test?
The frequency of this test depends entirely on your healthcare provider’s recommendations. They will determine if and when retesting is needed based on your medical history, symptoms, and lab results.
Can lifestyle changes affect DBP levels?
While Vitamin D Binding Protein itself is not directly influenced by lifestyle changes, maintaining overall health—such as proper nutrition, hydration, and managing chronic conditions—can support the body’s ability to process and transport substances like vitamin D effectively.
  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