Potassium measurements are useful in monitoring electrolyte balance in the diagnosis and treatment of disease conditions characterized by low or high blood potassium levels.
Potassium is another essential electrolyte, whose level in the blood is largely determined by the kidneys. Like sodium, screening for low or high levels of potassium can indicate a problem with health due to disease or inappropriate medication. Potassium levels are very sensitive to storage - if there is any delay in testing, the level is often higher than would otherwise be expected. Normally, it is readily apparent if the rise is due to storage change as other test results will usually be normal.