Ultrasound waves sent to the part of the body being examined are reflected, refracted, or absorbed at the interfaces inside the body. Echoes that return in this way carry information about the size, distance, and uniformity of internal organs.
An electrocardiogram (EKG/ECG) is an electrical recording of the heart and is used in the investigation of heart disease. An EKG may be done as part of a routine physical exam or when there are questions about the working of a patient’s heart.
A Doppler 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.