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Vitamin D Binding Protein (DBP) or Discriminating Index for Vitamin D Binding Protein (DBP) Measurement

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

This test measures the level of a protein that helps transport vitamin D in your blood. It may also be used to assess vitamin D status indirectly by evaluating how vitamin D binds to this protein.

Quick summary

["This test helps doctors understand how well your body may be using vitamin D."]

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

Key facts at a glance

LOINC
22419-6
Short code
MuV IgM Titr CSF
Synonyms
MuV IgM Titr CSF
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your healthcare provider may order this test if you have symptoms or risk factors related to vitamin D deficiency, such as muscle weakness, bone pain, or if you have conditions like kidney disease that affect vitamin D metabolism. It may also be used in research or specialized clinical settings to evaluate vitamin D binding dynamics.

What to Expect Before the Test

No special preparation is typically needed. You may be asked to fast for 8–12 hours before the blood draw, but always follow your provider’s instructions. Bring any medications or supplements you’re taking, as they could affect results.

How the Test Is Done

A healthcare professional will draw blood from a vein in your arm. The sample is sent to a lab for analysis, often using an immunoassay method to detect the protein levels.

Possible Results and Interpretation

Results are interpreted by your healthcare provider based on your medical history, symptoms, and other lab tests. Abnormal levels may indicate conditions affecting vitamin D binding or metabolism, but exact thresholds depend on clinical context.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Vitamin D Binding Protein Level

Frequently asked questions

What Does This Test Tell You About My Health?
This test can help identify if vitamin D is binding normally in your bloodstream. High or low levels of vitamin D binding protein may suggest underlying health issues, such as kidney disease or genetic disorders, that could impact how your body uses vitamin D.
How Often Should I Get This Test?
Your provider will determine how often you need this test based on your health status, symptoms, and other factors. Regular monitoring may be recommended if you have chronic conditions or are at higher risk for vitamin D-related problems.
Can Diet or Supplements Affect This Test?
While vitamin D binding protein itself is not directly affected by diet or supplements, changes in vitamin D levels (from supplements or diet) could indirectly influence its binding capacity. Always discuss your supplements with your healthcare provider before testing.
  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