In hyperparathyroidism, all are seen except

Parathyroid hormone (PTH), also called parathormone or parathyrin, is a hormone secreted by .... (most, 60-70%, of it in the proximal tubule), except in the thin segment of the loop of Henle. .... while secondary hyperparathyroidism is an appropriately high PTH level seen as a physiological .... "A mouse for all reasons".