Regulation of Water and Electrolytes
Water and electrolytes such as sodium and potassium, are monitored and controlled by the body. This regulation helps to ensure that
Dehydration with Elevated Sodium Levels
Dehydration generally causes elevated sodium levels in the blood, called hypernatremia. This occurs because most causes of fluid loss from the body -- sweating, vomiting, diarrhea -- result in more water loss than electrolyte loss, increasing the ratio of sodium to water in the blood (ref?).