護理師照護一位副甲狀腺功能亢進病人。應最密切監測哪項檢驗結果？

副甲狀腺素（PTH）的主要功能是調節體內鈣離子平衡。當副甲狀腺功能亢進（Hyperparathyroidism）時，PTH 分泌過多，導致骨骼中的鈣大量釋放進入血液，造成高血鈣（Hypercalcemia）。高血鈣會引起心律不整、意識改變及腎結石等嚴重併發症，因此血鈣濃度是此類病人最需密切監測的實驗室數值。

Hyperparathyroidism causes excessive secretion of parathyroid hormone, which mobilizes calcium from bones and increases serum calcium levels. Therefore, monitoring serum calcium is critical to detect hypercalcemia, which can lead to serious complications such as cardiac arrhythmias, altered mental status, and kidney stones.