PTH and Hypocalcemia: Interestingly, there were no significant differences in serum corrected calcium, phosphorus, and intact PTH between VDRA users and non-users, suggesting that VDRA use might successfully correct hypocalcemia (VDRA users vs non-users: 8.52 ± 0.94 vs 8.55 ± 0.93 mg/L, P = 0.6670).