In these studies the rapid recovery of plasma Ca2+ was examined after a brief induction of hypocalcemia with an EGTA infusion in parathyroidectomized (PTX), thyroidectomized (TX), thyroparathyroidectomized (TPTX) and calcitriol depleted rats and rats treated with different doses of PTH, CT and calcitriol. Here, CALCA is linked to Hypocalcemia.