Can dehydration affect potassium levels?

Yes, dehydration can significantly affect potassium levels, often leading to hypokalemia (low potassium). This occurs because fluid loss through vomiting, diarrhea, or sweating also depletes electrolytes like potassium. Severe dehydration may, in some cases, cause hyperkalemia, as kidney function may be compromised. A potassium test helps determine the extent of the imbalance and guides appropriate rehydration and electrolyte replacement therapy.