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Blood sodium level - Definition


Sodium is a chemical element present in the blood plasma in the form of positive ions with the chemical formula of Na+. This ion is involved in many different chemical reactions of the body. The presence of sodium in the blood enables water to pass from the blood vessels to the different cells of the body, and vice versa. Sodium concentration levels in the blood depend on the quantities of sodium and water present in the body as a whole. This element is also involved in renal function for the processes of regulating the quantity of water to be excreted or reabsorbed. Its concentration level, called plasma sodium concentration, indicated the state of hydration of the cells. When the levels rise to above normal values, it is called hypernatremia, and is indicative of cell dehydration. In the opposite case, hyponatremia is a term defining an excessive quantity of water in the cells.