18 下列何者不是副甲狀腺低能症（hypoparathyroidism）的臨床表徵？
腕足痙攣（carpopedal spasm） 低血鈣（hypocalcemia）
低血磷（hypophosphatemia） 正常鹼性磷酸酶（alkaline phosphatase）值
role of parathyroid hormone:
1. increase Ca
2. decrease PO4 by increasing renal excretion of PO4
3. PTH increases the activity of 1-α-hydroxylase enzyme, which converts 25-hydroxycholecalciferol to 1,25-dihydroxycholecalciferol, the active form of vitamin D.
carpopedal spasm:
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