How the Doppler effect is used in medicine?

Hint : The given question is a conceptual question. In order to answer the given question we need to know about the Doppler Effect and its various applications. After that we can write the answer for the given question.

Complete step by step answer
Step one
First of all we need to define the Doppler Effect.
We can define Doppler Effect as the change in frequency of a wave for an observer moving relative to its source. In other words, the Doppler Effect is an increase or decrease in the frequency of waves as the source and observer move toward or away from each other.
Step two
The Doppler Effect is commonly used in medicine.
It is used in Echocardiogram, Ultrasonography, Fetal monitoring etc.
The Doppler Effect is used to measure the direction and speed of flow of blood in arteries and veins. It is also used to diagnose vascular problems.
Echocardiography is used in the diagnosis of heart diseases. It provides the information regarding the shape and size of the heart, its pumping capacity, location and any tissue damage.
Fetal monitors provide information about the fetus.

Note: We should also know this fact that the Doppler Effect is also used in astronomy to measure the speed at which stars and galaxies are approaching or receding from us, during red shift or blue shift. The Doppler Effect is also used in radars to measure the velocity where a radar beam is fired on a moving object. Doppler radar is also used in weather stations.