Vitamin D Binding Protein (DBP) or Serum Protein Related to Vitamin D Metabolism (immunoassay)

What This Test Measures

Your healthcare provider may order this test to check the levels of vitamin D-binding protein (DBP), a protein in your blood that binds to vitamin D and other fat-soluble vitamins. This protein plays a role in transporting these vitamins throughout your body. The test helps assess how well your body is utilizing vitamin D and other fat-soluble vitamins.

Why It Might Be Ordered

Doctors may order this test if you have symptoms of vitamin D deficiency, kidney disease, or liver conditions. It can also be part of a broader evaluation for metabolic disorders or when monitoring certain medications that affect vitamin metabolism.

Common Reasons for Testing

Tests like this are sometimes performed when there are concerns about how well your body is managing fat-soluble vitamins. It may be used in conjunction with vitamin D levels to provide a more complete picture of your metabolic health.

Sample Collection and Preparation

A blood sample is typically drawn from a vein in your arm. You may be asked to fast for a few hours before the test, depending on your healthcare provider’s instructions. The blood is then sent to a lab for analysis using an immunoassay method to measure the protein concentration.