A.食物中维生素D不足 B.含量不足 C.婴儿生长快,钙磷需要量大 D.婴儿食物中钙磷含量少 E.皮肤接触日光中紫外线较少
A.4% B.6% C.7% D.8% E.10%
A.10%~15% B.20%~29% C.30%~39% D.40%~50% E.>60%以上
A.1.88~2.04mmo/L(7.5~8.1mg/dl) B.1.41~1.51mmo/L(5.5~6.0mg/dl) C.1.75~2.04mmo/L(7~8.1mg/dl) D.1.51~1.64mmo/L(6.0~6.6mg/dl) E.1.75~1.88mmo/L(7~7.5mg/dl)
A.血磷降低 B.碱性磷酸酶增高 C.血钙降低 D.血25-OHD3降低 E.甲状旁腺素增高