Potassium is an essential mineral that helps maintain fluid and electrolyte balance in the body. It is crucial for proper muscle and nerve function, and plays a role in regulating blood pressure and heart health. Blood tests can measure the level of potassium in the bloodstream, which can help diagnose conditions such as kidney disease, dehydration, and certain hormonal disorders. Low or high levels of potassium can cause a range of symptoms, from muscle weakness and cramps to heart palpitations and arrhythmias. Regular monitoring of potassium levels can help maintain overall health and prevent potential complications.