Which of the following is NOT a common cardiovascular test?

The answer indicates that an ultrasound is not a common test for cardiovascular assessment. However, it’s important to note that ultrasound is, in fact, commonly used in cardiovascular diagnostics. This technique is often employed in the form of echocardiograms, which visualize the heart’s structure and function, and it plays a crucial role in assessing various heart conditions.

Other commonly performed cardiovascular tests include EKGs, which measure the heart's electrical activity and identify issues such as arrhythmias; cardiac catheterization, which evaluates the coronary arteries and heart chambers; and exercise tolerance tests (ETT), which assess how the heart performs under physical stress. All these tests have specific purposes in evaluating cardiovascular health and are frequently utilized in clinical practice.

Given this information about cardiovascular tests, it is clear that all the options listed serve essential purposes in diagnosing and managing cardiovascular diseases, making the choice of ultrasound as the "none-common" test incorrect in this context.