Non-dialysis patients had similar preoperative PTH and totalcalcium serum values in 1HPT and 3HPT groups, regardless of HPT etiology, andwhether there was a multiglandular (hyperplasia) or uniglandular (adenoma) lesion.Glomerular filtration rates ≥ 60 mL/min were found in 81.4% of the 1HPT group and in48.4% of patients from the 3HPT group. Here, PTH is linked to hyperplasia.