Potassium normal range — check your value

Roughly 3.5 to 5.1 mEq/L.

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Your Potassium test value

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Potassium

mmol/L

What Potassium measures

The main electrolyte inside cells, critical for nerve conduction and the rhythm of the heart.

Potassium normal range chart

ResultPotassium (mmol/L)

Below rangeBelow 3.5

In range3.5 – 5.1

Above range5.1 and above

These bands are for female, 31–45 years. Enter your age and gender above to see the bands for you. The table below shows the range for every age and gender.

Potassium normal range by age and gender

AgeMaleFemale

0–1 years3.7 – 5.9 mmol/L3.7 – 5.9 mmol/L

2–6 years3.4 – 4.7 mmol/L3.4 – 4.7 mmol/L

7–11 years3.4 – 4.7 mmol/L3.4 – 4.7 mmol/L

12–17 years3.5 – 5.1 mmol/L3.5 – 5.1 mmol/L

18–30 years3.5 – 5.1 mmol/L3.5 – 5.1 mmol/L

31–45 years3.5 – 5.1 mmol/L3.5 – 5.1 mmol/L

46–60 years3.5 – 5.1 mmol/L3.5 – 5.1 mmol/L

60 years and above3.5 – 5.1 mmol/L3.5 – 5.1 mmol/L

What a high Potassium means, and common causes

Potassium is above range, called hyperkalaemia. High levels affect heart rhythm, so a genuinely high result is treated as urgent.

Common causes: Chronic kidney disease, ACE inhibitor and ARB blood pressure medicines, potassium-sparing diuretics, potassium supplements, adrenal insufficiency, and falsely high results when red cells break in the sample tube.

What a low Potassium means, and common causes

Potassium is below range, called hypokalaemia, which can cause muscle weakness, cramps and heart rhythm disturbances.

Common causes: Vomiting or diarrhoea, diuretic medicines, low magnesium, excessive laxative use, and some hormonal disorders.

Frequently asked questions

Roughly 3.5 to 5.1 mEq/L.

If red cells break during collection or transport they release potassium into the sample, producing a falsely high result. A repeat sample is the standard next step before acting on it.

ACE inhibitors and ARBs for blood pressure, potassium-sparing diuretics like spironolactone, and potassium supplements. Always list what you take when discussing the result.

Dil ki dhadkan par asar pad sakta hai, isliye isse turant doctor ko dikhana chahiye. Kabhi kabhi sample kharab hone se bhi number zyada aata hai.

Please note. This page explains what a number means against reference ranges for your age and gender. It does not diagnose anything, cannot see the rest of your report, and is no substitute for a doctor. If your lab’s printed range differs, your lab’s range applies.