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Vitamin D Binding Protein (DBP) or Vitamin D-Binding Protein (Serum)

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

This test measures the level of a protein in your blood that helps transport vitamin D. It can be used alongside vitamin D levels to assess vitamin D status and metabolism.

Quick summary

["This test helps evaluate how your body processes vitamin D."]

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

Key facts at a glance

LOINC
9573-7
Short code
RSV IgG Titr Ser IF
Synonyms
RSV IgG Titr Ser IF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
8
Ref high
61
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
CPT
82977
SNOMED
3110003
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 they suspect vitamin D deficiency, metabolic bone disease, or other conditions affecting vitamin D metabolism. It can also be part of a broader evaluation for kidney function or genetic disorders.

What to Expect Before the Test

No special preparation is typically needed. You may be asked to fast for a few hours before the blood draw, but this depends on your provider’s instructions. Bring any medications you’re currently 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. This process usually takes a few minutes and may cause a slight pinch or discomfort.

What the Results Mean

While the exact meaning of your results depends on your overall health and clinical context, this test provides insight into how well your body is using vitamin D. High levels may indicate overproduction or certain genetic conditions, while low levels could suggest vitamin D deficiency or kidney issues.

Reference range

Adult males: 8-61 U/L; Adult females: 5-36 U/LN/A

Specimen: serum

No special preparation required. Avoid fatty meals before the test if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Vitamin D Binding Protein

Frequently asked questions

How long does it take to get results from this test?
Results from this test are typically available within 1 to 3 business days, depending on your lab’s processing times. Your healthcare provider will discuss the findings with you during your follow-up visit.
Can I eat or drink anything before this test?
Check with your provider for specific instructions, but generally, you may eat a normal meal unless fasting is required for another reason. Avoid caffeine or alcohol before the blood draw if advised.
Does this test require fasting?
Sometimes fasting is recommended, but your provider will let you know if it applies to this test. If you’re unsure, ask your healthcare team before the appointment.
  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