Can you tell me how is a diagnosis of aortic stenosis made?

Echocardiogram: Physical exam can be helpful, but echocardiography (cardiac ultrasound) is generally the diagnostic study of choice. Using echo, you can examine the morphology and movement of the valve leaflets, and measuring blood flow velocities, you can estimate pressure gradients to assess severity of obstruction. Cath can sometimes be helpful in assessment and may allow intervention in some cases.