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Potassium

Serum Potassium K+
Serum (SST, without haemolysis) mmol/L

About this test

Principal intracellular cation. Small changes in extracellular potassium profoundly affect cardiac membrane potential.

Reference Ranges

Sex Age Range Notes
All ≥ 18 yrs 3.5 – 5 Adult

Clinical Interpretation

Low / Decreased
Hypokalaemia — diuretics, vomiting, diarrhoea, Conn's syndrome, refeeding syndrome, alkalosis, insulin excess.
High / Increased
Hyperkalaemia — AKI/CKD, Addison's disease, acidosis, haemolysis (spurious), ACE inhibitors, potassium-sparing diuretics.

Related Tests

Creatinine Sodium Bicarbonate Magnesium
Specimen
Serum (SST, without haemolysis)
Reporting Unit
mmol/L
Category
🧪 Clinical Biochemistry

⚠ Clinical Note
Reference ranges are indicative. Always interpret results in the context of the individual patient and local laboratory reference intervals, which may vary.