<prompt> Secondary hyperparathyroidism due to Vit D deficiency shows:HypocalcemiaHypercalcemiaHypophosphatemiaHyperphosphatemia  <response>: Vitamin D deficiency causes hypocalcemia and hypomagnesemia and decreases GI absorption of calcium and phosphate. Decreased serum Ca2 will stimulate PTH secretion. The secondary hyperparathyroidism will bring the Ca2 levels toward normal but cause phosphaturia. Thus serum phosphate loss will be fuher aggravated - hypophosphatemia. The level of calcium phosphate product is low, bone mineralization is impaired and demineralization is increased. 