The routine non-invasive examination for coronary heart disease primarily includes an essential electrocardiogram, as well as echocardiography. Blood tests generally look at cardiac enzymes and the status of troponin to check for any heart muscle damage. In terms of invasive methods, we can perform coronary angiography, which allows us to directly observe the condition of the coronary arteries. The condition of coronary arteries can also now be examined through a non-invasive CT angiography (CTA), which can also reveal any narrowing of the coronary arteries and assess the severity of such narrowing.