<prompt> Concentration of sodium in ECF is130-136 millimoleslit132-140 millimoleslit138-146 millimoleslit140-147 millimoleslit  <response>: Sodium levels are usually between 136to 145 mmolL . Blood sodium level less than 136mmolL mean you have less sodium Ref:Guyton and Hall textbook of medical physiology 12th edition,page number: 50 