Electrolytes
Potassium
Also known as: K
What it means
Essential for nerve signals and heart rhythm. Both very high and very low potassium can cause dangerous heart rhythm changes.
Typical normal range
3.5–5.0 mmol/L
Reference ranges vary by lab, age, sex, and pregnancy. Always check the range on your own report.
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Related terms in Electrolytes
Sodium
Main salt in your blood. Regulates fluid balance and blood pressure. Abnormal levels usually reflect hydration or kidney issues.
Calcium
Needed for bones, muscle contraction, and blood clotting. Blood calcium is tightly regulated — abnormal levels are a red flag.
Chloride
Works alongside sodium to balance fluids and acid-base status. Usually moves together with sodium.
This is a plain-language explanation for patients, not clinical advice. AI can be wrong. Always confirm with your doctor.