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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 fat-soluble vitamins through your bloodstream.

Quick summary

["DBP levels may affect how well your body uses certain vitamins and could be checked if you have vitamin D deficiency or related conditions."]

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

Key facts at a glance

LOINC
39917-0
Short code
NM Hrt Gated+EF W RNC IV
Synonyms
NM Hrt Gated+EF W RNC IV
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
nm
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

Your healthcare provider may order this test if you have symptoms like fatigue, muscle weakness, or bone pain that could be linked to vitamin D metabolism. It may also be part of a broader evaluation for conditions affecting vitamin D binding or transport, such as certain genetic disorders or kidney function issues.

What to Expect Before the Test

No special preparation is usually needed. You may fast for 8–12 hours before the test if instructed, but this is not always required. Bring any medications 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 is sent to a lab for analysis using a specialized immunoassay or similar method to measure DBP concentration.

What the Results Mean

Results are reported as a mass concentration (e.g., grams per liter). While reference ranges vary by lab, abnormal levels may indicate conditions affecting DBP production, kidney function, or vitamin D metabolism.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Elevated DBP levels may suggest conditions like nephrotic syndrome or certain genetic disorders, while very low levels could indicate kidney disease or other metabolic issues. However, DBP alone is not typically used to diagnose vitamin D deficiency—it’s often measured alongside vitamin D levels for context.

Short name

DBP Level

Frequently asked questions

How long does it take to get my results?
Results are usually available within 1–3 business days, depending on your lab and healthcare provider. Follow-up instructions will be provided by your provider.
What does a low or high DBP level mean?
Low DBP levels may signal kidney problems or genetic disorders affecting protein production, while high levels could be linked to kidney disease or other metabolic conditions. Your provider will interpret results in relation to your overall health.
Can I eat or drink before this test?
No strict fasting is required, but check with your provider if you have questions about timing. If instructed, avoid food/drinks for 8–12 hours before blood draw for accuracy.
  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