<prompt> Answer this question truthfullyWhat is the result of the combination of elevated PTH and decreased 1,25-OH2D3 in CKD, and what is the condition that arises from this combination?  <response>: <reason> In CKD, the combination of elevated PTH and decreased 1,25-OH2D3 produces renal osteodystrophy, in which there is increased bone resorption and osteomalacia. 