Potassium Test for Heart Health - Serum Potassium Test

This laboratory test measures the concentration of potassium ions (K⁺) in blood serum or plasma. Potassium is the main intracellular cation and plays a crucial role in maintaining the electrical potential of the cell membrane. It is essential for nerve transmission, muscle contraction (including the heart muscle), and maintaining fluid, acid-base balance in the body. Its level is precisely regulated by the kidneys and the hormone aldosterone.