A Doppler ultrasound is a noninvasive test that can be used to estimate the blood flow through the heart and blood vessels and may help diagnose many conditions such as blood clots, functioning valves abnormalities, a blocked artery and artery stenosis, aneurysms, heart valve defects, and congenital heart disease, blood flow problems with liver, kidneys, pancreas, spleen.
The test may be done as an alternative to more invasive procedures such as angiography. Besides, this test is safe, painless, and doesn't use radiation.