A Doppler ultrasound test utilizes reflected sound waves to perceive how blood courses through a vein. It helps doctors assess blood course through real supply routes and veins, for example, those of the arms, legs, and neck. It can demonstrate blocked or reduced flow of blood through thin ranges in the real supply routes of the neck that could bring about a stroke . It likewise can uncover blood clusters in leg veins (deep vein thrombosis, or DVT) that could loosen up and block blood flow to the lungs (pulmonary embolism). During pregnancy, Doppler ultrasound might be utilized to take a gander at blood stream in an unborn infant (embryo) to check the strength of the hatchling.

During Doppler ultrasound , a handheld instrument (transducer) is ignored softly the skin over a vein. The transducer sends and gets sound waves that are opened up through a receiver. The sound waves bounce off strong articles, including platelets. The development of platelets causes an adjustment in pitch of the reflected sound waves (called the Doppler impact). In the event that there is no blood stream, the pitch does not change. Data from the reflected sound waves can be handled by a computer to give ghraphs or pictures that speak to the stream of blood through the veins. These charts or pictures can be saved for future review or evaluation.