Hypernatremia: Elevated blood sodium.
Sodium is the major positive ion (cation) in fluid outside of cells. The chemical notation for sodium is Na+ (from natrium, a synonym for sodium). When combined with chloride (Cl), the resulting substance is table salt (NaCl).
Excess sodium (such as from fast food hamburger and fries) is excreted in the urine. Too much (or too little) sodium can cause cells to malfunction, and extremes can be fatal.
The normal blood sodium level is 135 - 145 milliEquivalents/liter (mEq/L), or in international units, 135 - 145 millimoles/liter (mmol/L).
Sodium levels are tightly controlled in a healthy individual by regulation of urine concentration and production and regulation of the thirst response.
Hypernatremia results when there is a net water loss or a hypertonic sodium gain and reflects too little water in relation to total body sodium and potassium.
Library > Literature & Language > Dictionary ( hÄ« ' pÉ™r-nÉ™-trÄ“ ' mÄ“-É™ ) n. An abnormally high plasma concentration of sodium ions. [ HYPO- + New Latin natrium ...
Hypernatremia Definition. The normal concentration of sodium in the blood plasma is 136-145 mM. Hypernatremia is defined as a serum sodium level over 145 mM.
Hypernatremia is high sodium in the blood that occurs with excessive fluid loss. When fluid is lost and not replaced, sodium is not adequately excreted from the body.