Medical heart tests such as an electrocardiogram, an echocardiogram, cardiac catheterization and cardiac magnetic resonance imaging are performed by doctors in order to determine the health of a patient's heart, states Mayo Clinic. Through these tests, doctors can see the structures of a patient's heart.
If a patient has heart disease or is suspected to have heart disease, then heart tests may be performed, states Mayo Clinic. These tests help a doctor determine the type of heart disease a patient has and determine the severity of the disease and the treatment plan. Doctors may also order routine blood tests and a chest X-ray.