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Vitamin D Binding Protein (DBP) – Serum Immunoassay

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

This test measures the level of Vitamin D Binding Protein, a protein in your blood that helps transport vitamin D and other fat-soluble molecules. It may be checked alongside vitamin D levels to assess overall vitamin D status and metabolism.

Quick summary

["This test helps evaluate how your body processes vitamin D and related compounds."]

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

Key facts at a glance

LOINC
70863-6
Short code
RABV IgM Ser Ql IF
Synonyms
RABV IgM Ser Ql IF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
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

Why This Test Might Be Ordered

Your healthcare provider may order this test if you have symptoms of vitamin D deficiency (like fatigue, bone pain) or if you have conditions that affect vitamin D metabolism, such as kidney disease or certain liver disorders. It may also be part of a broader evaluation for genetic disorders or metabolic screening.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for 8–12 hours before the draw if your provider specifies it. Bring any medications you’re currently taking, as some may affect results.

What the Test Involves

A healthcare professional will draw blood from a vein in your arm. You may feel a slight pinch, but it typically only takes a few minutes. The blood sample is sent to a lab for analysis using an immunoassay method to detect the protein.

What the Results Mean

Results are not typically reported alone but are often interpreted alongside vitamin D levels, kidney function tests, or other clinical findings. High or low levels of DBP alone may not indicate a specific condition but can help guide further testing or treatment planning.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

DBP Serum

Frequently asked questions

What does a high level of Vitamin D Binding Protein mean?
High levels of DBP alone don’t indicate a single cause. They may be linked to genetic conditions affecting protein metabolism, kidney disease, or other metabolic disorders. Your provider will consider your full medical history and other test results to interpret results accurately.
How often should I get this test?
The frequency depends on your health status. If you have a known condition (like kidney disease or a genetic disorder), your provider may recommend regular monitoring. Otherwise, this test is often part of a broader evaluation and may not be routine unless symptoms or risk factors suggest it.
Can diet or supplements affect this test?
Dietary factors like vitamin D intake or fat-soluble vitamin levels may indirectly influence DBP levels, but the test itself measures the protein itself, not its transport capacity. Supplements or medications that affect vitamin D metabolism could influence results, so always inform your provider of any medications you’re taking.
  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