PTH and hyperparathyroidism: The main findings of the present study included lower serum albumin, Cr/BSA and higher rate of patients with serum albumin < 38 g/L at baseline in the group of patients with severe hyperparathyroidism (PTH ≥ 1,500 pg/ml) compared to the group with moderate hyperparathyroidism (PTH 600–1,499 pg/ml) and the group with PTH level within the target range (PTH 200–599 pg/ml).