Potassium, Serum


Potassium is both an electrolyte and a mineral. It helps keep the water and electrolyte balance of the body. Potassium is also important in the transmission of nerve and muscle impulses. Potassium level is in an inverse relationship with sodium level and is also affected by aldosterone.


Hyperkalemia is caused by defective renal excretion, Addison’s disease. Hypokalemia can be seen in gastrointestinal fluid loss (vomiting, diarrhea), renal disease, with certain diuretics and hyperaldosteronism. Hypokalemia has been found in >90% of hypertensive patients with primary aldosteronism. See Also Hypokalaemia and Hyperkalemia

Sample Type, Quantity & Conditions

1 ml Serum Stability: 7 Days at 2-8 °C

Special Precautions

Avoid haemolysed samples.

Normal Range

3.5 - 5.13mEq/L 3.5 - 5.31 mmol/L Critical values: < 2.8 & > 6 mEq/L

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