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Vitamin D Binding Protein (DBP) Immunoassay, Serum

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

This test measures the level of vitamin D binding protein (DBP) in your blood, which helps transport vitamin D and other steroids. It may be used to assess vitamin D metabolism or related conditions.

Quick summary

["Your doctor may order this test to check protein levels linked to vitamin D function."]

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

Key facts at a glance

LOINC
74808-7
Short code
vWf:Ac Act/Nor imm 1:1 NP PPP IA
Synonyms
vWf:Ac Act/Nor imm 1:1 NP PPP IA
Category
chemistry
Sample
plasma
Container
Lavender-top (EDTA) or Green-top (Heparin)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
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 Is Done

Doctors may request this test if they suspect conditions affecting vitamin D metabolism, such as certain genetic disorders or kidney/liver diseases. It can also be part of broader evaluations for hormonal or metabolic issues.

What to Expect Before the Test

No special preparation is needed, but avoid alcohol or certain medications that might affect protein levels 24 hours before testing. Fasted or non-fasted samples may be collected based on clinical protocol.

How the Test Works

Blood is drawn from a vein, typically in your arm. The sample is processed to separate serum (liquid part of blood without clotting factors) and analyzed using an immunoassay method to detect DBP.

What the Results Mean

Results are expressed in arbitrary units concentration (e.g., g/dL) and compare to general population ranges. Abnormal levels may indicate underlying health concerns that require further evaluation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

DBP Immunoassay

Frequently asked questions

What causes abnormal DBP levels?
Abnormal DBP levels can result from conditions affecting protein synthesis (e.g., liver/kidney disease), genetic mutations, or inflammatory states. Your doctor will consider your full medical history and other test results.
How long does it take to get results?
Results are typically available within 1–3 business days, depending on lab processing times. Follow-up with your healthcare provider to discuss findings.
Can diet affect this test?
Dietary factors like protein intake may indirectly influence protein levels, but vitamin D binding protein itself isn’t directly affected by diet. Avoid alcohol or medications that alter protein metabolism before testing.
  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