PTH and Hypocalcemia: During routine examinations, he was noted to have hypocalcaemia with a total serum calcium level of 1.30 mmol/L (normal range, 2.11–2.52 mmol/L) and a serum phosphate level of 1.66 mmol/L (normal range, 0.85–1.51 mmol/L), while the serum PTH level was 705 pg/ml (normal range, 15-65 pg/ml).