Potassium homeostasis is the physiological process and associated research field concerned with maintaining a stable and optimal concentration of potassium ions within the intracellular and extracellular fluid compartments of an organism. This concept investigates the intricate regulatory mechanisms, primarily involving renal excretion, cellular uptake, and hormonal control, that ensure proper potassium balance, which is critical for fundamental cellular functions, including membrane potential, nerve impulse transmission, muscle contraction, and osmotic regulation.