What is Potassium? Your Complete Guide
Potassium is critical for heart rhythm, muscle function, and nerve signals. Your body keeps potassium in a very tight range because abnormal levels directly affect your heart.
💡Simply Explained
Potassium is the mineral that keeps your heart beating in rhythm and your muscles working properly. Your body keeps it in a very tight range because even small changes directly affect your heart. It's one of the most dangerous electrolytes to have out of balance.
📏Normal Range
Typical reference range. Your lab may use slightly different values.
⬆️What High Potassium Means
Possible Causes
- Kidney disease (can't excrete potassium)
- Medications (ACE inhibitors, potassium-sparing diuretics)
- Hemolyzed blood sample (falsely high — very common lab artifact!)
- Tissue damage or burns
- Addison's disease
Foods That Can Help
- Temporarily reduce: bananas, oranges, potatoes, coconut water, tomatoes
- Avoid salt substitutes (they contain potassium chloride)
- Choose lower-potassium fruits: apples, berries, grapes
⬇️What Low Potassium Means
Possible Causes
- Diarrhea and vomiting
- Diuretic medications
- Excessive sweating
- Low dietary intake
- Chronic kidney disease (some types)
Foods That Can Help
- Bananas — the classic potassium food
- Coconut water (excellent potassium source)
- Potatoes and sweet potatoes
- Spinach and leafy greens
- Oranges and orange juice
- Dals and legumes
🏃Lifestyle Actions
If Your Potassium Is High
- Get the test repeated — hemolyzed samples give falsely high results (very common!)
- If confirmed, review medications with your doctor
- Limit high-potassium foods temporarily
- If on ACE inhibitors or ARBs, your doctor should monitor regularly
If Your Potassium Is Low
- Include potassium-rich foods in your diet
- If on diuretics, discuss potassium supplementation with doctor
- Treat diarrhea/vomiting promptly
🩺When to See a Doctor
High Potassium
Potassium above 6.0 mEq/L — potential heart rhythm emergency. Go to ER. Between 5.0-6.0 — repeat test (may be hemolysis artifact) and see a doctor within 1-2 days.
Low Potassium
Potassium below 2.5 mEq/L — ER visit needed (heart rhythm risk). Between 2.5-3.5 — see a doctor within a few days. Mild drop (3.0-3.5) — increase dietary potassium.
🎯Did You Know?
The most common cause of "high potassium" on a blood test isn't actually high potassium — it's a hemolyzed sample (red blood cells burst during collection, releasing their potassium). Always confirm with a repeat test!
❓Frequently Asked Questions
What is Potassium?
Potassium is the mineral that keeps your heart beating in rhythm and your muscles working properly. Your body keeps it in a very tight range because even small changes directly affect your heart. It's one of the most dangerous electrolytes to have out of balance.
What is the normal range for Potassium?
The typical normal range for Potassium is 3.5–5 mEq/L.
What causes high Potassium?
Kidney disease (can't excrete potassium). Medications (ACE inhibitors, potassium-sparing diuretics). Hemolyzed blood sample (falsely high — very common lab artifact!).
What causes low Potassium?
Diarrhea and vomiting. Diuretic medications. Excessive sweating.
How can I check my Potassium levels?
You can check your Potassium levels with a routine blood test. Upload your lab report to ScanHealth for an instant, plain-language explanation.
Check Your Potassium Results Instantly
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Upload Your ReportThis guide is for informational purposes only and does not constitute medical advice. Reference ranges may vary by lab. Always consult a qualified healthcare provider for diagnosis and treatment.