Vitamin D Binding Protein (DBP) Serum Concentration

What Is This Test Measuring?

Vitamin D binding protein (DBP) is a globulin protein found in serum that binds to vitamin D and its metabolites, facilitating their transport through the bloodstream. This test quantifies its concentration to evaluate how effectively vitamin D is carried and utilized in your body.

Why Might You Need This Test?

Your healthcare provider may order this test if they suspect vitamin D deficiency, metabolic bone disease, or conditions affecting protein synthesis in the liver or kidneys. It can also be part of broader evaluations for genetic disorders or conditions impacting vitamin D metabolism.

Sample Collection and Preparation

A blood sample is drawn from a vein in your arm. The sample is collected in a tube and sent to the lab for analysis. Serum is separated from the blood cells and used for testing. This process helps ensure accurate measurement of vitamin D binding protein levels.

What Does the Result Mean?

Results are typically reported as a concentration value (e.g., in mg/dL or g/dL). While reference ranges can vary by lab, abnormal levels may indicate underlying health concerns that require further investigation, such as liver or kidney disease, genetic disorders, or vitamin D-related conditions.