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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 hormones in your body.

Quick summary

["DBP levels can affect how your body processes certain vitamins and hormones."]

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

Key facts at a glance

LOINC
14528-4
Short code
RUBV Ag Spt Ql IF
Synonyms
RUBV Ag Spt Ql IF
Category
chemistry
Sample
sputum
Container
Sterile sputum container
Units
N/A
Ref low
0.8
Ref high
1.2
Critical range
— – 5 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
CPT
85610
SNOMED
396252006
Specimen volume
3-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if they suspect conditions related to vitamin D metabolism, hormone transport, or kidney function. It could also be part of a broader evaluation for genetic disorders or conditions affecting protein synthesis in the liver or kidneys.

What to Expect Before the Test

No special preparation is usually needed. You may be asked to fast for 8–12 hours before the test if it involves a blood draw, but this is not always required for DBP testing alone. Bring any medications or supplements you’re taking to your appointment.

What the Test Involves

A healthcare professional will draw blood from a vein in your arm. The blood sample will be sent to a lab for analysis. The process typically takes a few minutes, and you may feel slight discomfort, but it’s usually over quickly.

What the Results Mean

Results are used to assess protein levels in your blood, which can help diagnose or monitor conditions like kidney disease, liver disease, or genetic disorders. Abnormal levels may indicate how well your body is processing certain vitamins or hormones.

Reference range

INR: 0.8-1.2 (warfarin: 2.0-3.0)N/A

Specimen: sputum

Inform your healthcare provider if you are taking blood thinners. No special preparation required.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

DBP

Frequently asked questions

What Does It Measure?
This test measures the concentration of Vitamin D Binding Protein (DBP) in your serum. DBP is a protein that binds to vitamin D and other hormones, helping regulate their distribution in the bloodstream. Abnormal levels may suggest issues with protein synthesis, kidney function, or metabolic disorders.
How Might My Results Affect My Treatment?
If your results are outside the expected range, your healthcare provider may recommend further testing or adjustments to your treatment plan, especially if you have a known condition like kidney disease or liver dysfunction. They may also check for related issues, such as vitamin D levels or hormone imbalances.
Could This Test Be Part of a Larger Evaluation?
Yes, DBP testing is sometimes included in evaluations for genetic disorders (like hereditary angioedema), kidney disease, or liver disease. It may also be used alongside other tests to monitor how your body processes vitamins, hormones, or medications that rely on protein carriers.
  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