Fluid Electrolyte Composition of Body Compartments

Fluid Electrolyte Composition of Body Compartments

	Plasma (mEq/L)	Interstitial (mEq/L H₂O)	Intracellular^a(mEq/L H₂O)
Cations
Na	142	145	10
K	4	4	159
Ca	5	5	<1
Mg	2	2	40
Anions
Cl	104	117	3
HCO₃	24	27	7
Proteins	16	<0.1	45
Others	9	9	154

^aIntracellular electrolytes are difficult to measure, and most of the measurements are from myocytes, which may or may not be applicable to other cell types.

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Table 8-2