Understanding Sodium: Normal vs Optimal Ranges

?What is Sodium?

Sodium is the primary electrolyte in the blood and extracellular fluid, playing a critical role in fluid balance, nerve impulse transmission, and muscle contraction. The kidneys tightly regulate sodium levels through a complex hormonal system involving aldosterone, ADH, and the renin-angiotensin system.

!Why It Matters

Sodium imbalances — hyponatraemia (low sodium) and hypernatraemia (high sodium) — can both cause serious neurological symptoms. Hyponatraemia is the most common electrolyte disorder in clinical practice, often related to overhydration, diuretics, heart failure, or liver disease. Chronic mildly low sodium is associated with osteoporosis and falls in the elderly.

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 sodium: nausea, headache, confusion, seizures (severe cases)
• High sodium: extreme thirst, confusion, muscle twitching, dehydration

How to Improve Your Levels

• 1Hyponatraemia: identify and treat the underlying cause — rarely requires salt supplementation
• 2Hypernatraemia: increase fluid intake, identify dehydration cause
• 3Optimal dietary sodium for general health: 2000–3000 mg/day (not too low, not too high)

When to Test

Part of basic metabolic panel. Essential monitoring in patients on diuretics, with heart failure, kidney disease, or liver cirrhosis.

Related Biomarkers