[討論] Vitamin D deficiency rickets
醫學四 15.
維生素 D 缺乏佝僂症（vitamin D deficiency rickets）的病童，下列那一種檢查結
果最為罕見？
(A)正常血鈣值 (B)低血磷值（Hypophosphatemia）
(C)正常血清副甲狀腺素濃度 (D)正常血清 1,25-Dihydroxyvitamin D 濃度
答案(C)
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印象中(D)1,25-Dihydroxyvitamin D應該濃度是上升的吧??
decreased levels of Ca absorbed in the intestines
-> decreased levels of Ca in blood
-> levels of 25 hydroxy vit D decrease
-> an increase in parathyroid hormone so as to raise serum calcium levels
-> increases 1,25 dihydroxyvitamin D
-> increases mobilization of Ca from bone matrix
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