Doppler scan

• A Doppler ultrasound test uses reflected sound waves to see how blood flows through a blood vessel.
• It helps doctors evaluate blood flow through major arteries and veins, such as those of the arms, legs, and neck.
• It shows blocked or reduced blood flow through narrowing in the major arteries of the neck that could cause a stroke.
• It reveals blood clots in leg veins (deep vein thrombosis, or DVT) that could break loose and block blood flow to the lungs (pulmonary embolism).
• During pregnancy, Doppler ultrasound may be used to look at blood flow in an unborn baby (fetus) to check the health of the fetus.

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