Potassium
Potassium controls heart rhythm, muscle contractions, and fluid balance. Both high and low levels can be dangerous and need prompt attention.
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What Potassium measures
Potassium is an electrolyte that flows in and out of cells to generate the electrical signals that contract your heart and muscles. Serum potassium measures the small amount circulating in blood — even small changes can affect heart rhythm, which is why this value is monitored closely in patients on certain medications.
Normal ranges
Reference ranges may vary slightly by lab. Always use the range provided on your specific test report.
What affects your potassium level
- Kidney disease (the most common cause of high potassium)
- ACE inhibitors, ARBs, and potassium-sparing diuretics
- Severe diarrhea or vomiting (causes low)
- Heavy sweating without electrolyte replacement
- Low magnesium (drives potassium loss)
- Addison's disease (rare)
Foods that may help
Bananas, oranges, melons
Classic potassium-rich fruits — easy daily option
Sweet potatoes and potatoes
Among the highest potassium foods per serving
Beans and lentils
Potassium plus fiber and protein
Leafy greens and tomatoes
Potassium-dense and nutrient-broad
Salmon and avocado
Potassium plus healthy fats
When to see your doctor
Any level outside 3.5–5.0 mEq/L should be confirmed. If you take ACE inhibitors, ARBs, or diuretics, potassium should be monitored regularly. Never take potassium supplements without medical guidance — overcorrection can be life-threatening.
Related biomarkers
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Educational content only · Not medical advice