在正常情况下,血钙维持在2.25～2.6mmol/L(9～10.3mg%),性别之间及各实验室正常标准可有微小差别。甲状旁腺激素(PTH)、维生素D及降钙素(CT)对维持血钙水平起决定性作用,镁通过与PTH相互作用可影响钙平衡。钙离子具有生物活性,约占血总钙的50%,, Under normal circumstances, blood calcium maintained at 2.25 ~ 2.6mmol / L (9 ~ 10.3mg%), between the sexes and the normal laboratory standards can be slightly different. PTH, vitamin D and calcitonin (CT) play a decisive role in maintaining serum calcium levels, and magnesium affects calcium balance by interacting with PTH. Calcium ions with biological activity, accounting for about 50% of total blood calcium