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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 in your body, so its levels can be relevant if you have concerns about vitamin D metabolism or related conditions.

Quick summary

["Your doctor may order this test to check how well your body handles vitamin D."]

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

Key facts at a glance

LOINC
31615-8
Short code
RRV IgM Ser Ql
Synonyms
RRV IgM Ser Ql
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
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 recommend this test if you have symptoms or risk factors related to vitamin D metabolism, such as unexplained fatigue, muscle weakness, or conditions like nephrotic syndrome or certain genetic disorders. It could also be part of a broader evaluation for kidney function or protein-related disorders.

What to Expect Before the Test

No special preparation is usually needed. You may have a small needle inserted into your arm for a blood draw, similar to other routine blood tests. If you’re on blood thinners or have a history of bleeding disorders, let your doctor know beforehand.

What the Results Mean

Results are reported as a concentration of DBP in your blood. While reference ranges vary by lab, abnormal levels may indicate conditions affecting protein synthesis, kidney function, or fluid balance. Your doctor will interpret results in the context of your overall health.

Common Conditions Affecting DBP Levels

Low levels of DBP might be linked to kidney disease, liver disease, or certain genetic disorders (e.g., familial Mediterranean fever). High levels could suggest conditions like nephrotic syndrome, where the kidneys lose too much protein into urine. Always discuss results with your provider.

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 causes vitamin D binding protein levels to be checked?
Your doctor may order this test if you have symptoms like muscle pain, fatigue, or if you have a known condition that affects protein levels in the blood, such as kidney disease or liver problems. It can also be part of a broader evaluation for genetic disorders or metabolic issues.
How long does it take to get the results of this test?
Test results typically arrive within 1 to 3 business days, depending on your lab’s processing time. Your healthcare provider will contact you once the results are ready.
Can diet or supplements affect vitamin D binding protein levels?
While diet and supplements primarily influence vitamin D levels, they may indirectly affect protein metabolism. However, DBP levels are primarily tied to kidney and liver function, so lifestyle factors like diet alone are less likely to impact this test directly. Always follow your doctor’s advice for test-related questions.
  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