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natremia The presence of sodium ions in the blood. Derived terms . dysnatremia; hypernatremia; hyponatremia; natremic; Translations
From Wikipedia, the free encyclopedia. Hypernatremia or hypernatraemia is an elevated sodium level in the blood. Hypernatremia is generally not caused by an excess of sodium, but rather by a relative deficit of free water in the body. For this reason, hypernatremia often coincides with dehydration.evere symptoms are usually due to acute elevation of the plasma sodium concentration to above 157 mEq/L (normal blood levels are generally about 135-145 mEq/L for adults and elderly) Values above 180 mEq/L are associated with a high mortality rate, particularly in adults.