Vitamin D binding protein (DBP) or Vitamin D-binding protein (VDBP) mass concentration

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms or conditions linked to vitamin D metabolism, such as unexplained fatigue, bone pain, or certain genetic disorders. It may also be used in research or specialized clinical settings to evaluate protein levels indirectly tied to vitamin D transport.

What to Expect Before the Test

No special preparation is typically needed. You may have a simple blood draw from a vein in your arm. If you’re taking blood thinners or have a history of bleeding disorders, let your provider know.

What the Test Results Mean

Results are usually reported as a mass concentration (e.g., grams per liter). While reference ranges vary by lab, abnormal levels might suggest conditions affecting protein synthesis, kidney function, or vitamin D metabolism. Your provider will interpret results in the context of your overall health.

Common Conditions Linked to This Test

While vitamin D-binding protein itself isn’t directly linked to many common diseases, its levels can be studied in conditions like hereditary vitamin D-resistant rickets or other metabolic disorders. It may also be monitored in research or specialized cases where vitamin D transport is under investigation.