Angiography, which involves injecting a contrast agent into a blood vessel and diagnosing a vascular lesion through imaging, costs about$2,000. This is an invasive test, the contrast agent may appear allergic reaction, mainly for coronary artery stenosis, to see whether the degree of stenosis can be installed stents, because it can clearly see the coronary artery blood vessel alignment, choose the radial artery for puncture, in the put in an arterial catheterization sheath, followed by penetration of the guidewire, all the way up to the opening of the coronary artery, can be injected into the contrast agent, the sheath of the radial artery into the tube is difficult to be put in, then it is necessary to The radial artery sheath is difficult to put in, so it needs to be put in from the femoral artery. If the vessel alignment is abnormal, the whole procedure will take longer and will not harm your health. If the stenosis is severe, it will be eligible for stent implantation, and the angiography is a common test with an acceptable price.