Potassium
| Category | Biochemistry |
|---|---|
| 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 |