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Vitamin D Binding Protein (DBP) Mass Concentration in Serum/Plasma

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

["DBP supports vitamin D metabolism and hormone transport, but its direct clinical role is less emphasized than vitamin D itself."]

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

Key facts at a glance

LOINC
79197-0
Short code
GH 2h p Arg+Ins SerPl-mCnc
Synonyms
GH 2h p Arg+Ins SerPl-mCnc
Category
hormone
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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

What Is Vitamin D Binding Protein?

Vitamin D Binding Protein (DBP) is a protein in your blood that binds to vitamin D and other hormones, helping them stay in circulation. While DBP itself isn’t directly linked to vitamin D deficiency, it plays a supporting role in hormone transport. Your body produces DBP to maintain balance, but levels can vary based on genetics, hydration, and health conditions.

Why Might You Need This Test?

This test may be ordered if you have symptoms related to hormone imbalances, kidney or liver issues, or if your doctor wants to assess protein levels in your blood. Some conditions, like certain genetic disorders or kidney disease, can affect DBP levels.

How Is the Test Performed?

A blood sample is taken from a vein, usually in your arm. The sample is then sent to a lab for analysis using a specialized technique to measure DBP concentration. The test typically takes a few days for results to be processed.

What Do the Results Mean?

Results are reported as a mass concentration (in units like mg/dL or g/L), but exact reference ranges vary by lab. Abnormal levels may indicate underlying health concerns, such as protein disorders or metabolic imbalances, but further evaluation is needed for interpretation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

DBP Level

Frequently asked questions

Why might my doctor order this test?
Your doctor may order this test if they suspect a condition affecting protein metabolism, such as nephrotic syndrome, liver disease, or genetic disorders. It can also be part of broader evaluations for hormone-related symptoms or kidney function.
What are the typical reference ranges?
Reference ranges for DBP vary by lab and may not be widely standardized. Your doctor will interpret results in the context of your overall health and symptoms.
Can lifestyle changes affect DBP levels?
Yes, hydration status, diet, and certain medications can influence protein levels. Maintaining proper hydration and discussing medications with your doctor can help ensure accurate results.
  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