Electrolytesblood
Serum Electrolytes
Measures salts such as sodium and potassium that balance body fluids.
What it measures
Sodium, potassium and chloride levels.
Why it is ordered
To assess hydration, kidney function and heart-rhythm risks.
How to prepare
No special preparation usually needed.
What happens during the test
A blood sample is drawn from a vein.
Normal ranges
| Group | Normal range |
|---|---|
| Sodium | 135 – 145 mmol/L |
| Chloride | 98 – 107 mmol/L |
| Potassium | 3.5 – 5.1 mmol/L |
Ranges vary slightly between laboratories.
What abnormal results may mean
Abnormal electrolytes can affect the heart, nerves and muscles.
Related conditions: Kidney disease, Dehydration
Related tests: KFT
⚠️ Important: Abnormal results do not mean you have a disease. Always discuss your results with your doctor.