PTH and Hypocalcemia: This assumption was further demonstrated by Del Rio et al. [6] who showed that, among the 101 patients presenting with hypocalcemia (serum calcium < 7.5mg/dL) beyond postoperative day 1, only 49 had PTH values less than 12 pg/mL, whereas the others 52 patients had PTH values within the normal range; additionally, there was no statistically significant difference in absolute PTH values in patients with hypocalcemia compared with patients with eucalcemia [6].