PTH and Hypocalcemia: As shown in Table 1, initial laboratory findings revealed severe hypocalcemia (5.4 mg/dL) (8.8–10.2 mg/dL), with an albumin-corrected calcium level of 6.03 mg/dL (8.9–10.3 mg/dL), low ionized calcium (0.44 mmol/L) (1.0–1.30 mmol/L), elevated PTH (242 pg/mL) (19–88 pg/mL), and hyperphosphatemia (5.5 mg/dL) (2.5–4.9 mg/dL) but normal vitamin D-25 level (56 ng/mL) (>30 ng/mL).