Vitamin D Binding Protein (DBP) – Serum

What Does This Test Measure?

Vitamin D Binding Protein (DBP) is a protein in your blood that binds to vitamin D and transports it throughout your body. While its primary role is related to vitamin D, it can also play a role in how other proteins interact with vitamin D’s effects. This test helps assess your body’s ability to handle vitamin D and may be part of broader evaluations for vitamin D deficiency or related metabolic processes.

Why Might This Test Be Ordered?

Doctors may order this test if you have symptoms or conditions linked to vitamin D metabolism, such as unexplained fatigue, bone pain, or if you have a history of vitamin D-related disorders. It may also be part of a broader panel to monitor protein interactions or kidney function, as DBP is produced in the liver and kidneys.

How Is the Test Performed?

A blood sample is drawn from a vein in your arm. The sample is then processed in a lab to measure the concentration of Vitamin D Binding Protein. No special preparation is usually needed, but you may be asked to fast for a few hours before the test if instructed by your healthcare provider.

What Are Possible Results?

Results are typically reported as a concentration level of DBP in the blood. While reference ranges can vary by lab, they are often used to compare your level to what is expected in healthy individuals. Abnormal results may prompt further testing or evaluation of underlying conditions.