The following is a list of English-speaking population by country, including information on both native speakers and second-language speakers.
Sodium plays many important roles in the body. It maintains fluid balance and is a main nutrient used in nerve impulse transmission and muscle contraction. The normal range for blood sodium is between 135 and 145 mEq/L (3.10 mg/ml to 3.34 mg/ml). Higher levels of sodium are normally associated with hypertension. A sodium level of 150 mEq/L (3.45 mg/ml) or more is known as hypernatremia, a condition that is commonly caused by dehydration or eating too much salt. However it can also be caused by other conditions such as diabetes or hormonal imbalances.
Blood sodium levels below 136 mmol/L may mean you have hyponatremia or low blood sodium and too much water in your body. Blood sodium levels greater than 145 mmol/L may mean you have hypernatremia, a condition in which blood sodium levels are too high for the amount of water in your body.