Hello I wish good health to all my friends. I had two questions. 1: Is free vitamin D in serum the same as vitamin D in VDBP in terms of immunological properties and can it be identified with a similar monoclonal antibody? 2: In making the extraction buffer for vitamin D ELISA kit, is the best way to separate vitamin D from VDBP pH shock or can other cases be used? If my friends have any other suggestions, I would be grateful if you could guide me. Thanks