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

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 hormones in your body.

Quick summary

["Understanding your DBP levels can help assess how well your body is handling vitamin D and related hormone transport."]

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

Key facts at a glance

LOINC
21237-3
Short code
CMV IgM Titr CSF IF
Synonyms
CMV IgM Titr CSF IF
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
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 Might Be Ordered

Your healthcare provider may order this test if you have symptoms related to vitamin D deficiency, kidney disease, or conditions affecting protein metabolism. It may also be part of a broader evaluation for hormonal imbalances or genetic disorders.

What to Expect Before the Test

No special preparation is usually needed. You may fast before the test if instructed, but your provider will confirm. Bring any medications you’re currently taking, as they can sometimes affect test results.

What the Test Involves

A blood sample will be taken from a vein in your arm. You may feel a slight pinch, but it typically doesn’t cause discomfort. The sample is collected in a tube and sent to the lab for analysis.

What the Results Mean

Results are reported as a concentration of DBP in your blood. While reference ranges vary by lab, lower levels may indicate conditions affecting protein production or kidney function, while higher levels could suggest liver disease or other metabolic issues. Your provider will interpret results in the context of your overall health.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

DBP Level

Frequently asked questions

What Does a Low DBP Level Indicate?
Low levels of DBP might suggest conditions like nephrotic syndrome (kidney disease causing protein loss), liver disease, or certain genetic disorders that affect protein synthesis. It can also be part of broader evaluations for vitamin D metabolism or hormonal imbalances.
What Does a High DBP Level Indicate?
Elevated DBP levels may be associated with liver disease, chronic kidney disease, or conditions that increase protein production. In some cases, it can also be a normal variation in individuals with certain genetic backgrounds.
How Often Should I Get This Test?
Your provider will determine how often you need this test based on your medical history, symptoms, and other test results. Typically, it’s not a routine screening test but may be recommended periodically if you have ongoing health concerns related to protein metabolism or hormone transport.
  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