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Potassium (K): normal range & what your result means
Potassium keeps your heart and muscles working. Because both high and low levels disturb the heart rhythm, abnormal results are taken seriously.
Typical adult reference range
| Measure | Range |
|---|---|
| Normal | 3.5–5.0 mmol/L |
| Low (hypokalaemia) | < 3.5 mmol/L |
| High (hyperkalaemia) | > 5.0 mmol/L |
What a HIGH result can mean
- High potassium can cause dangerous heart-rhythm changes and needs prompt attention; often from kidney problems or medicines
What a LOW result can mean
- Low potassium can cause weakness, cramps and palpitations; often from vomiting, diarrhoea or diuretics
Ranges vary by lab. Reference ranges are TYPICAL ADULT values and vary by laboratory, age, sex, pregnancy and the method used. Always read your result against the range printed on YOUR report, and let your doctor interpret it alongside your history.
Frequently asked questions
Why is high potassium dangerous?
Potassium controls the heart’s electrical activity — a high level can trigger a life-threatening rhythm. That is why it is corrected urgently when very high.
Can a blood sample give a falsely high potassium?
Yes — if red cells break during collection (haemolysis), potassium leaks out and reads high. If a result is unexpectedly high, the test is often repeated.
Explore more
Sources & further reading
- World Health Organization (WHO)
- MedlinePlus — U.S. National Library of Medicine
- Ministry of Health & Family Welfare, India
- Indian Council of Medical Research (ICMR)
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.