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The Sodium (Na+) test measures the concentration of sodium — the most abundant electrolyte in the blood and extracellular fluid...
Also known as: Serum Sodium Test · Na+ Blood Test · Serum Na Test · Sodium Level Test
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*Inclusive of home collection charges
The Sodium (Na+) test measures the concentration of sodium — the most abundant electrolyte in the blood and extracellular fluid — in your serum. Sodium is the primary determinant of blood volume, blood pressure, and fluid balance between body compartments. Both low sodium (hyponatraemia) and high sodium (hypernatraemia) affect brain function and can cause neurological symptoms ranging from confusion to seizures, making sodium one of the most clinically important electrolytes to monitor. No fasting required.
Key benefits of this package include:
What Does the Sodium (Na+) Test Measure?
| Level / Result | Possible Interpretation |
|---|---|
| 136–145 mEq/L (Normal) | Normal sodium and fluid balance |
| 130–135 mEq/L (Mild hyponatraemia) | Common with diuretic use, hypothyroidism, or excess fluid intake — usually asymptomatic |
| 125–130 mEq/L (Moderate hyponatraemia) | Nausea, headache, fatigue — medical evaluation and careful correction needed |
| < 125 mEq/L (Severe hyponatraemia) | Risk of confusion, seizures, cerebral oedema — urgent medical attention required |
| 146–150 mEq/L (Mild hypernatraemia) | Mild dehydration or excess sodium — increase fluid intake; assess cause |
| 150–160 mEq/L (Moderate hypernatraemia) | Significant dehydration — confusion, lethargy; gradual fluid replacement required |
| > 160 mEq/L (Severe hypernatraemia) | Severe dehydration — seizures, coma risk; medical emergency; controlled IV fluid replacement |
Important Note: Sodium results must be interpreted alongside urine sodium, urine osmolality, blood pressure, fluid status, medications, and clinical symptoms. Rapid correction of sodium abnormalities — in either direction — is dangerous and can cause osmotic demyelination (for hyponatraemia) or cerebral oedema (for hypernatraemia). Management requires specialist guidance.
The Paradox of Hyponatraemia — Too Much Water, Not Too Little Sodium: Hyponatraemia is the most common electrolyte abnormality in hospitalised patients, but it is often misunderstood. In most cases, hyponatraemia does not mean the body lacks sodium — it means the body has too much water relative to sodium, diluting the concentration. This is why giving salty water (saline) can paradoxically worsen some forms of hyponatraemia. Identifying the underlying cause — SIADH, hypothyroidism, heart failure, excessive water drinking — is essential before choosing the correct treatment.
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