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Blood is screened for different diseases and cholesterol levels. Doctors can quickly screen for a host of problems during a typical physical exam. A higher reading means you should monitor your blood pressure more frequently and make lifestyle changes or take medications to bring it under control. It provides one indication of whether your heart is working as it should. If you have no family history of early heart disease or symptoms such as abnormal rhythms, chest tightness or pain, you should have your first EKG at about age 50, and repeat it every three to five years.