What is the normal range for serum sodium?

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Multiple Choice

What is the normal range for serum sodium?

Explanation:
Normal serum sodium is 135–145 mEq/L. Sodium is the primary extracellular cation that helps regulate osmolality and fluid balance, so this range keeps water distribution and nerve function stable. Levels below 135 hyponatremia can cause water to move into cells, leading to cerebral edema and neurologic symptoms; levels above 145 hypernatremia cause cellular dehydration and neurologic changes as water moves out of cells.

Normal serum sodium is 135–145 mEq/L. Sodium is the primary extracellular cation that helps regulate osmolality and fluid balance, so this range keeps water distribution and nerve function stable. Levels below 135 hyponatremia can cause water to move into cells, leading to cerebral edema and neurologic symptoms; levels above 145 hypernatremia cause cellular dehydration and neurologic changes as water moves out of cells.

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