Understanding Your Potassium Blood Test

What is a Potassium Test?

A potassium test is a blood test that measures the amount of potassium in your blood serum. Potassium is a crucial electrolyte that helps your nerves and muscles function properly, and maintains your heart's normal rhythm.

Why is the Test Performed?

• Monitor kidney function
• Evaluate unexplained muscle weakness
• Track treatment effects for high blood pressure
• Monitor side effects of medications
• Diagnose abnormal heart rhythms

Normal Range

The typical normal range for potassium is:

• Adults: 3.5 to 5.0 millimoles per liter (mmol/L)
• Results may vary slightly between laboratories

Preparation for the Test

Before Your Test:

• Inform your healthcare provider about all medications
• Follow fasting instructions if provided
• Avoid clenching your fist during blood draw

Understanding Results

High Potassium (Hyperkalemia) > 5.0 mmol/L

• Kidney disease
• Certain medications (especially ACE inhibitors)
• Excessive dietary intake
• Dehydration

Low Potassium (Hypokalemia) < 3.5 mmol/L

• Diuretic use
• Vomiting or diarrhea
• Excessive sweating
• Certain kidney disorders

Follow-up Care

Your healthcare provider will determine if you need:

• Medication adjustments
• Dietary modifications
• Additional testing
• Regular monitoring

When to Seek Medical Attention

Contact your healthcare provider if you experience:

• Severe muscle weakness
• Irregular heartbeat
• Significant fatigue
• Numbness or tingling