Potassium (serum)

Potassium (serum)

Used for the determination of serum potassium on the Beckman Coulter UniCel DxC600 Synchron Clinical System.

Instrument: Beckman Coulter UniCel DxC600

Specimen Type: Serum

NOTE: Unable to report results for hemolyzed or grossly lipemic specimens.

Volume per test: 40uL (min volume 150uL)


Sodium and Potassium ion concentrations are determined by indirect potentiometry. The sodium method utilizes two glass sodium electrodes (one acts as the reference electrode), whereas the potassium method utilizes a potassium selective electrode in conjunction with a sodium reference electrode.

To measure the concentrations of either electrolyte, a precise volume of sample (40┬ÁL) is mixed with a buffered solution at a ratio of 1:33. The high molarity buffer used establishes a constant activity coefficient for sodium or potassium ions, calibrating the electrode to concentration values.

Testing Range: 1-15 mmol/L