A potassium blood test can detect the amount of potassium in the body. An electrocardiogram (ECG or EKG) test can also be recommended to check on the heartbeat rhythms. As kidneys play a major role in the balance of potassium in the body; a kidney function test is necessary. The diabetic condition also influences potassium levels in the body. Diabetic tests also will be helpful. Early consultation and discussion of symptoms will make way for early tests and treatment.