What is normal Sodium potassium and uric acid level in blood
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Here is a complete, textbook-verified summary of normal blood levels for all three electrolytes/metabolites:
Normal Blood Reference Ranges
🧂 Sodium (Na+)
| Value | |
|---|---|
| Normal range | 135-145 mmol/L (mEq/L) |
| Below normal (hyponatremia) | < 135 mmol/L |
| Above normal (hypernatremia) | > 145 mmol/L |
Sodium is the primary extracellular solute and the main regulator of plasma osmolality (normal: 280-295 mOsm/kg H₂O). - Textbook of Family Medicine 9e
🔋 Potassium (K+)
| Value | |
|---|---|
| Normal range | 3.5-5.0 mmol/L (mEq/L) |
| Below normal (hypokalemia) | < 3.5 mmol/L |
| Above normal (hyperkalemia) | > 5.0 mmol/L |
| Average serum value | ~4.5 mmol/L |
Potassium is the main intracellular ion. Even small changes in serum potassium reflect large intracellular shifts and can cause significant cardiac and neuromuscular effects. - Sabiston Textbook of Surgery
🔴 Uric Acid (Serum Urate)
| Group | Normal Range |
|---|---|
| Men | 238-516 μmol/L (4.0-8.6 mg/dL) |
| Women | 178-351 μmol/L (3.0-5.9 mg/dL) |
| Urine uric acid (24-hr) | < 750 mg/day |
Women have lower uric acid levels due to the uricosuric (uric acid-excreting) effect of estrogen. Hyperuricemia is defined as uric acid > 6.8-7 mg/dL and is associated with gout and kidney stones. - Harrison's Principles of Internal Medicine 22E (2025)
Clinical Notes
- Uric acid and gout: Up to 50% of patients will have normal uric acid levels during an acute gouty attack, so a normal result does not rule out gout. The treatment target for gout management is serum urate < 6 mg/dL (or < 5 mg/dL if tophi are present).
- Potassium and the heart: Hypokalemia (K+ < 3.5) can cause dangerous cardiac arrhythmias, especially in patients on digoxin.
- Sodium and osmolality: For every 100 mg/dL rise in blood glucose, serum sodium falls by approximately 1.6 mmol/L (a dilutional effect).
Lab reference ranges can vary slightly between hospitals and laboratories depending on the assay method used. Always interpret results alongside your local laboratory's reference range.
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