Coronary heart disease (CHD) is usually diagnosed after a risk assessment and some further tests. Coronary artery disease (CAD) causes impaired blood flow in the arteries that supply blood to the heart. Also called coronary heart disease (CHD), CAD is the most common form of heart disease … Coronary artery disease (CAD)   risk can often be assessed with blood Mild, early stage CAD is diagnosed with specialized diagnostic tests such as echocardiogram and angiogram.