What characterizes hypernatremia?

• A. Serum sodium level below 135 mEq/L
• B. Serum sodium level between 135-145 mEq/L
• C. Serum sodium level greater than 145 mEq/L
• D. Serum sodium level greater than 155 mEq/L

Answer: (C)

Hypernatremia is characterized by a serum sodium level greater than 145 mEq/L. This condition typically indicates an imbalance in sodium and water levels in the body, often resulting from water loss or sodium retention. Hypernatremia can manifest as symptoms like thirst, confusion, muscle twitching, and in severe cases, seizures or coma, as the elevated sodium level can lead to cellular dehydration.

A serum sodium level above 145 mEq/L reflects an excess of sodium in relation to the body’s fluid levels, which is crucial for understanding the clinical significance of this electrolyte disturbance. Monitoring these levels helps healthcare providers assess hydration status and may indicate underlying conditions such as diabetes insipidus or inadequate water intake.