What are the tests for dilated cardiomyopathy?

Echocardiogram. Echocardiogram is the definitive first line test for dilated cardiomyopathy. The most common cause of dilated cardiomyopathy is coronary artery disease, so cardiac cath often is also a test required in dilated cardiomyopathy to determine the presence and severity of coronary artery disease. Aortic or mitral valve disease can also cause dilated cardiomyopathy, both detected on echocardiogram.