Serum or plasma concentration of flavoprotein (e.g., flavin adenine dinucleotide, FAD)

What Flavoproteins Do in Your Body

Flavoproteins are essential cofactors in enzymes involved in breaking down nutrients like carbohydrates and fats. They also help in the production of ATP (energy) and participate in antioxidant processes that protect cells from oxidative damage. Some flavoproteins are involved in the metabolism of certain vitamins and hormones.

How This Test Is Performed

This test involves drawing blood from a vein in your arm. The blood sample is then processed to separate serum or plasma, where the flavoprotein concentration is measured using a specialized biochemical assay. The result is expressed as a concentration value, though exact reference ranges vary by lab.

Why You Might Need This Test

Your healthcare provider may order this test if you have symptoms or conditions related to vitamin deficiencies (such as riboflavin deficiency), metabolic disorders, or if flavoprotein-related enzymes are suspected to be impaired. It can also be part of broader metabolic or nutritional evaluations.

What to Expect Before the Test

No special preparation is typically required, but you may be asked to fast for a few hours before the blood draw if instructed by your doctor. Wear loose clothing and fasten your shirt collar to make drawing blood easier. Avoid smoking or consuming caffeine right before the test if advised.