Potassium

Also known as: Serum Potassium, K+

Kidney Blood
Patient Friendly Summary

Potassium is your heart's electrical stabilizer. If your report shows an unexpected abnormal value, don't panic — your doctor may first repeat the test to rule out sample-related error.

What this test means

Potassium is critical for heart rhythm and muscle function. Both high and low levels can affect the heart, so doctors take abnormal values seriously.

Why it is done

It is done with kidney tests, blood pressure medicines, diuretics, and for muscle weakness or palpitations.

Understanding your value

If your value is high

High potassium can be seen with kidney problems and certain medicines, and can affect heart rhythm — clearly high values are treated without delay. Sometimes a damaged (hemolyzed) sample shows falsely high potassium and just needs a repeat.

If your value is low

Low potassium can follow vomiting, diarrhoea, or diuretics, causing weakness or cramps.

About the normal range

The common range is about 3.5–5.0 mEq/L. Sample handling can affect results, so unexpected highs are often repeated for confirmation.

When to consult a doctor

Contact your doctor promptly for any flagged potassium value, especially with palpitations, severe weakness, or known kidney disease.

Frequently Asked Questions

It is done with kidney tests, blood pressure medicines, diuretics, and for muscle weakness or palpitations. Your doctor will decide if this test is right for your situation.

High potassium can be seen with kidney problems and certain medicines, and can affect heart rhythm — clearly high values are treated without delay. Sometimes a damaged (hemolyzed) sample shows falsely high potassium and just needs a repeat. This needs clinical correlation — always discuss your report with your doctor.

Low potassium can follow vomiting, diarrhoea, or diuretics, causing weakness or cramps. This needs clinical correlation — always discuss your report with your doctor.

A single value rarely tells the whole story. Results need to be read together with your symptoms, history, and other tests. Please consult your doctor for a proper interpretation.

Quick Facts

  • TestPotassium
  • Short formsSerum Potassium, K+
  • Sample typeBlood
  • CategoryKidney

Related Terms

High Low Kidney Function

Specialists

Nephrology Cardiology

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Disclaimer: This information is for patient education only and does not replace medical advice, diagnosis, or treatment. Always consult a qualified doctor.