Coronary angiography for risk assessment is not recommended in patients with SIHD who elect not to undergo revascularization or who are not candidates for revascularization because of comorbidities or individual preferences.306,366 (Level of Evidence: B) 2. Coronary angiography is not recommended to fur- ther assess risk in patients with SIHD who have preserved LV function (EF >50%) and low-risk criteria on noninvasive testing.306,366 (Level of Evidence: B) 3. Coronary angiography is not recommended to assess risk in patients who are at low risk according to clinical criteria and who have not undergone nonin- vasive risk testing. (Level of Evidence: C) 4. Coronary angiography is not recommended to assess risk in asymptomatic patients with no evi- dence of ischemia on noninvasive testing. (Level of Evidence: C) Coronary angiography defines coronary anatomy, including the location, length, diameter, and contour of the epicardial coronary arteries; the presence and severity of coronary luminal obstruction(s); the nature of the obstruction; the presence and extent of angiographically visible collateral flow; and coronary blood flow. Despite the ability of newer noninvasive imaging modalities such as CT angiography to visualize and characterize the coronary tree, invasive coro- nary angiography currently remains the gold standard. Coronary angiography has 2 clinical goals: 1) to assess a patient s risk of death and future cardiovascular events through characterization of the presence and extent of ob- structive CAD and 2) to ascertain the feasibility of percuta- neous or surgical revascularization. The likelihood that re- vascularization might decrease angina and improve a patient s quality of life should be considered when a patient deems his or her quality of life unsatisfactory despite a conscientious program of evidence-based medical therapy. 