Welcome back to the May episode for the Wash U Nephrology Web Episode Series! We are bringing one of our faculty members, Dr. Seth Goldberg to talk about bone mineral metabolism. Calcium, phosphorus, PTH, Vitamin D, FGF23, Klotho, and more. Although it may seem like a typical powerpoint presentation, pay close attention to the animations as they really help explain the way all of these players help maintain homeostasis, and how things go wrong with a decreasing GFR.