Concentration of sodium in ECF is
Sodium levels are usually between 136to 145 mmol/L . Blood sodium level less than 136mmol/L mean you have less sodium Ref:Guyton and Hall textbook of medical physiology 12th edition,page number: 50
130-136 millimoles/lit
132-140 millimoles/lit
138-146 millimoles/lit
140-147 millimoles/lit
General physiology