Potassium
Category | Biochemistry |
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Test background |
Electrolytes are usually measured as part of a renal profile, which measures sodium, potassium, creatinine and urea. Potassium is found mainly inside the body’s cells but a small, vital amount is found in the plasma. Monitoring potassium is important as small changes in the plasma potassium concentration can affect the heart’s rhythm and ability to contract. |
Clinical Indications |
Suspected renal failure Monitoring of patients receiving intravenous fluids Monitoring of established chronic kidney disease Urine potassium for differential diagnosis of hypokalaemia |
Reference range | Blood 3.5-5.3 mmol/L |
Sample & container required | SST (gold top) 24 hour urine collection |
Sample volume | Blood: 0.5 mL; Urine: 24 hour collection |
Turnaround time | Blood 1 day; Urine 2 days |