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镁是人体中仅次于钙(60000毫克当量)、钠(5500毫克当量)、钾(3000毫克当量),占第四位含量最丰富的正离子,在细胞内则是除钾外的第二个最重要离子。以70公斤体重计算,人体内含镁量为2000毫克当量左右,将近50%贮存于骨骼中,以磷酸镁和碳酸镁的形式存在,其余分布在肌肉组织及其它软组织中,仅1%镁在细胞外液。由于原子吸收光谱测定法和其它新技术的出现,已有可能迅速而准确地对镁进行测量,正常人平均血清镁浓度为1.6～2.0毫克当量/升;心肌
Magnesium is second only to calcium (60000 milliequivalents), sodium (5500 milligrams equivalent), potassium (3000 milligrams equivalent), accounting for the fourth most abundant positive ions in the cell is the second addition to potassium The most important ion. With a body weight of 70 kg, the amount of magnesium in the human body is about 2000 milliequivalents, nearly 50% is stored in the bones, in the form of magnesium phosphate and magnesium carbonate, and the rest is distributed in muscle tissue and other soft tissues with only 1% magnesium Extracellular fluid. Due to the appearance of atomic absorption spectrometry and other new technologies, it has been possible to measure magnesium rapidly and accurately, with an average normal serum magnesium concentration of 1.6 to 2.0 meq / l; myocardial