Vitamin D binding protein (DBP) concentration

What Is This Test Measuring?

Vitamin D binding protein (DBP) is a carrier protein found in your blood that binds to vitamin D and other fat-soluble hormones, including calcitriol (the active form of vitamin D). This test evaluates the concentration of DBP, which can be important in conditions affecting vitamin D metabolism or hormone transport.

Why Might You Need This Test?

Your healthcare provider may order this test if you have symptoms or conditions linked to vitamin D deficiency, hormone imbalances, or kidney/liver disorders. It can also be part of broader evaluations for conditions like pseudohypoparathyroidism or certain genetic disorders affecting hormone transport.

How Is the Test Performed?

A blood sample is drawn from a vein, typically in your arm. The sample is then processed to measure DBP levels using an immunoassay or similar method to detect its presence in the serum or plasma.

What Do the Results Mean?

Results may be compared to reference ranges provided by your lab, though exact values can vary. Elevated levels might indicate conditions like nephrotic syndrome or certain genetic disorders, while low levels could suggest kidney disease or other metabolic issues. Interpretation depends on clinical context and other test results.