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Serum or Plasma Vitamin D Binding Protein (DBP) Concentration

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

This test measures the amount of vitamin D binding protein (DBP) in your blood. DBP helps transport vitamin D and other hormones in your body.

Quick summary

["Your doctor may check this test to understand how your body handles vitamin D and related substances."]

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

Key facts at a glance

LOINC
44536-1
Short code
HTLV I DNA Bld Ql Probe
Synonyms
HTLV I DNA Bld Ql Probe
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your healthcare provider may order this test if they suspect an issue with how your body processes certain hormones or vitamins, such as vitamin D. It can also be part of a broader evaluation for conditions affecting protein metabolism or hormone transport.

What to Expect Before the Test

No special preparation is usually needed. You may have a small needle inserted into your arm to draw blood. If you’re taking blood from a vein in your arm, you might feel a slight pinch or sting. If you’re taking blood from a finger, it may feel like a small prick.

What the Test Results Mean

Results are not typically provided as a single numeric range since DBP levels can vary based on factors like age, sex, and overall health. Your doctor will compare your results to your personal baseline or clinical context to interpret them.

Common Reasons for Testing

This test may be used in conjunction with other blood tests to assess conditions like vitamin D deficiency, kidney disease, or hormonal imbalances. It can also help monitor how well your body is transporting important substances.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Vitamin D Binding Protein Level

Frequently asked questions

What does a low or high level of vitamin D binding protein mean?
Low levels of DBP might indicate conditions affecting protein synthesis or kidney function, which could impact how your body transports vitamins and hormones. High levels could suggest certain genetic disorders or liver issues. Your doctor will discuss these findings with you in detail.
How long will it take to get my results?
Results are usually available within a few days to a couple of weeks, depending on your lab’s processing time. Your healthcare provider will contact you once they have the results and explain what they mean for your health.
Can I eat or drink anything before this test?
You can eat and drink normally before this test unless your doctor has given you specific instructions. Blood tests like this are generally done on an empty stomach, but this test does not require fasting.
  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