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Vitamin D Binding Protein (DBP) – Serum or Plasma Concentration

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

This test measures the amount of Vitamin D Binding Protein in your blood. DBP helps transport vitamin D and other hormones in your body.

Quick summary

["Understanding your DBP levels can help assess how well your body is using vitamin D and other substances."]

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

Key facts at a glance

LOINC
30325-5
Short code
CMV IgM SerPl Ql
Synonyms
CMV IgM SerPl Ql
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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

Doctors may order this test if you have symptoms related to vitamin D deficiency, kidney disease, or other conditions affecting hormone transport. It can also be part of a broader evaluation for metabolic or endocrine disorders.

What to Expect Before the Test

No special preparation is usually needed. You may fast before the test if instructed by your healthcare provider, but this is not always required for this specific test. Bring any medications you’re currently taking to your appointment.

What the Results Mean

Results are not typically provided as a single reference range since DBP levels can vary based on factors like kidney function and genetic differences. Your doctor will interpret the result in relation to your overall health and symptoms.

Common Reasons for Testing

This test may be used alongside other vitamin D tests (like 25-hydroxy vitamin D) to evaluate vitamin D metabolism, kidney function, or conditions affecting protein synthesis in the liver.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

DBP Level

Frequently asked questions

What is a normal range for this test?
There isn’t a single standard reference range for DBP levels because they can vary widely. Your doctor will compare your result to your specific health profile, including kidney function and other lab results.
How often should I get this test?
This test is usually not routine unless you have symptoms or conditions that suggest DBP-related issues. Follow your healthcare provider’s recommendations for testing frequency.
Can diet affect DBP levels?
Dietary factors like protein intake may influence DBP production, but vitamin D binding protein itself is primarily produced in the liver. Changes in diet are less likely to directly alter DBP levels compared to other factors like kidney function or genetics.
  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