Potassium
Potassium is a key electrolyte for heart rhythm, muscle contraction, and nerve function. Both low and high levels can be dangerous.
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Normal ranges
Adults: 3.5–5.1 mmol/L.
Units: mmol/L
Causes of deviations
Low levels:
Diuretics, vomiting, diarrhea, low intake, hyperaldosteronism.
High levels:
Kidney disease, ACE inhibitors, tissue breakdown, acidosis.
When to see a doctor
If outside the reference range — abnormal levels can affect the heart.
Related biomarkers
Panels
Electrolyte panel
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