Hypernatremia is defined as serum sodium above what level?

Hypernatremia is defined as serum sodium above what level?

• A. Na > 150
• B. Na > 145
• C. Na > 155
• D. Na > 160

Answer: (A)

Hypernatremia occurs when the serum sodium concentration rises above the normal range, creating a hyperosmolar state that pulls water out of cells. The normal sodium range is about 135–145 mEq/L. In many clinical contexts and exam questions, a practical cut-off used to define clinically significant hypernatremia is a serum sodium level above 150 mEq/L. Levels at or above this threshold are more likely to produce noticeable symptoms from cellular dehydration, especially in the brain, such as confusion, irritability, seizures, or coma. Although technically any value above 145 mEq/L indicates hypernatremia, the 150 mEq/L mark is the convention used in this item to denote a clearer, more impactful level.

Hypernatremia occurs when the serum sodium concentration rises above the normal range, creating a hyperosmolar state that pulls water out of cells. The normal sodium range is about 135–145 mEq/L. In many clinical contexts and exam questions, a practical cut-off used to define clinically significant hypernatremia is a serum sodium level above 150 mEq/L. Levels at or above this threshold are more likely to produce noticeable symptoms from cellular dehydration, especially in the brain, such as confusion, irritability, seizures, or coma. Although technically any value above 145 mEq/L indicates hypernatremia, the 150 mEq/L mark is the convention used in this item to denote a clearer, more impactful level.