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总体钾约为每公斤体重50mEq,即70公斤体重者为3500mEq。钾是细胞内最多的阳离子,总体钾的98%在细胞内。钾的细胞内总浓度(以肌肉的化学分析为根据)是150~160mEq/L,但细胞游离钾浓度可能相当低(以电极选择性离子测量为依据)。因为正常细胞外液钾浓度维持在3.5~5.5mEq/L之间,两个重要的体液间隔之间存在一个大的钾浓度梯度。
The total potassium is about 50mEq per kilogram of body weight, that is, 3500kgEq for 70kg body weight. Potassium is the most intracellular cation, with 98% of total potassium in the cell. The total intracellular concentration of potassium (based on chemical analysis of muscle) is 150-160 mEq / L, but the concentration of free potassium in cells may be quite low (based on electrode-selective ion measurements). Because normal extracellular potassium concentration remains between 3.5 and 5.5 mEq / L, there is a large potassium concentration gradient between the two important fluid compartments.