Understanding Potassium: Normal vs Optimal Ranges

?What is Potassium?

Potassium is the major intracellular electrolyte, essential for maintaining cell membrane potential, nerve signal transmission, muscle contraction (including the heart), and acid-base balance. The kidneys regulate potassium excretion and maintain tight serum potassium within a narrow range.

!Why It Matters

Potassium imbalances can be life-threatening because of their effects on cardiac rhythm. Hypokalaemia (low potassium) causes muscle weakness, cramps, constipation, and cardiac arrhythmias. Hyperkalaemia (high potassium) is particularly dangerous — it can cause fatal cardiac arrest if severe. Both are relatively common and often related to medications (diuretics, ACE inhibitors).

Reference Ranges

Lab normal ranges may vary between laboratories. Optimal and longevity targets are based on research literature and should be interpreted with your physician.

Symptoms of Imbalance

• Low potassium: muscle weakness, cramps, fatigue, constipation, palpitations
• High potassium: muscle weakness, tingling, dangerous cardiac arrhythmias

How to Improve Your Levels

• 1Low potassium: increase dietary potassium — bananas, potatoes, avocados, coconut water, legumes
• 2If taking diuretics: potassium-sparing diuretics or supplements under medical supervision
• 3High potassium: avoid potassium-rich foods if kidneys are impaired

When to Test

Part of standard metabolic panel. Critical monitoring in patients on diuretics, ACE inhibitors, ARBs, or with kidney disease.

Related Biomarkers