Dr Chan Po Fun [MBBS, MRCP, FRCP (UK), FAMS (Cardiology)] is a consultant cardiologist in Singapore with a focused practice in cardiovascular risk reduction. The short answer A CT coronary angiogram (CTCA) looks directly at the major coronary arteries for plaque and narrowing. A stress test assesses how the heart responds to exercise or medication and looks for evidence that blood flow becomes inadequate under stress. Stable but recurring or unexplained chest discomfort? CTCA