Sodium

Understanding the marker

Sodium regulates the body's fluid balance and nerve function. The value is kept within narrow limits, and abnormalities usually reflect fluid imbalance.

Sodium is interpreted with hydration, medicines, kidney function and symptoms. Both high and low concentrations can be clinically important; the urgency depends on the level, rate of change and clinical situation.

What does high Sodium mean?

A high sodium concentration can reflect too little water relative to sodium. Fluid balance, symptoms, kidney function and any medicines help establish the cause. A substantial or rapid change can need prompt medical care.

What does low Sodium mean?

A low sodium concentration reflects the balance between sodium and water in the blood. Assessment includes the actual level, symptoms, fluid balance and any medicines. A substantial or rapid change can need prompt medical care.