Vitamin D Binding Protein (DBP) – Serum Concentration
This test measures the level of a protein in your blood that helps transport vitamin D. It can be part of a broader evaluation for vitamin D metabolism or related conditions.
This test helps assess how your body processes vitamin D.
Key facts at a glance
- LOINC
- 92688-1
- Short code
- C parvum+hominis DNA Stl Ql NAA+probe
- Synonyms
- C parvum+hominis DNA Stl Ql NAA+probe
- Category
- coagulation
- Sample
- stool
- Container
- Clean container
- Units
- N/A
- Ref low
- 10
- Ref high
- 40
- Critical range
- — – 500 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- probe-amp-tar
- CPT
- 84484
- SNOMED
- 302774002
- Specimen volume
- 5 g
- Stability
- Refrigerated: 24h, Frozen: 7d
- TAT
- 4–24 hours
- Order
- routine
Why This Test Might Be Ordered
Your healthcare provider may order this test if you have symptoms of vitamin D deficiency, kidney disease, or other conditions affecting vitamin D metabolism. It may also be used to monitor treatment for conditions like hypophosphatasia or certain genetic disorders.
What to Expect Before the Test
No special preparation is usually needed. You may be asked to fast for 8–12 hours before the test if your blood is drawn early in the morning. Wear comfortable clothing and plan to stay near the testing site for a short time.
What Happens During the Test
A healthcare professional will insert a small needle into a vein in your arm to draw a blood sample. You may feel a slight pinch, but the process is quick. The blood sample is then sent to a lab for analysis.
What the Results Mean
Results are typically reported as a concentration of the protein in the blood. While specific reference ranges vary by lab, lower-than-expected levels may indicate conditions affecting protein synthesis or kidney function, while higher levels may suggest certain genetic or metabolic disorders.
Reference range
Adult: 10-40 U/LN/A
No special preparation required. Avoid fatty meals before the test if possible.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Vitamin D binding protein (DBP) plays a key role in transporting vitamin D and other fat-soluble vitamins in the blood. Abnormal levels can be linked to conditions like hypophosphatasia (a genetic disorder), kidney disease, or metabolic disorders. This test may also be used to evaluate vitamin D status indirectly, especially in cases where vitamin D levels alone are unclear.
Short name
Vitamin D Binding Protein
Frequently asked questions
What does a vitamin D binding protein test measure?
Why might my doctor order this test?
Can I eat or drink before this test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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 17, 2026. · Read our editorial policy