A 2d echo with a Doppler is also known as a two-dimensional Echocardiography with Doppler. It is a standard medical scanning test. Echocardiography with Doppler uses ultrasound technology to give your doctor a live-moving picture of your heart. It does not carry any radiation, unlike x-ray and CT scans. Hence it can be done even to pregnant women. It is a noninvasive test and also a pain-free test. It takes less than a few minutes.