An echocardiogram uses sound waves to produce images of your heart. This common test allows your doctor to see your heart beating and pumping blood. Your doctor can use the images from an echocardiogram to identify heart disease.
Depending on what information your doctor needs, you may have one of several types of echocardiograms. Each type of echocardiogram involves few, if any, risks

Computed tomography (CT) is a diagnostic imaging test used to create detailed images of internal organs, bones, soft tissue and blood vessels. The cross-sectional images generated during a CT scan can be reformatted in multiple planes, and can even generate 3D images which can be viewed on a computer monitor, printed on film or transferred to electronic media. CT scanning is often the best method for detecting many different cancers since the images allow your doctor to confirm the presence of a tumor and determine its size and location. CT is fast, painless, noninvasive and accurate. In emergency cases, it can reveal internal injuries and bleeding quickly enough to help save lives.

A Holter monitor is a small, battery-powered medical device that measures your heart’s activity, such as rate and rhythm. Your doctor may ask you to use one if they need more information about how your heart functions than a routine electrocardiogram (EKG) can give them.
Twenty-four hour Holter monitoring is a continuous test to record your heart’s rate and rhythm for 24 hours. You wear the Holter monitor for 12 to 48 hours as you go about your normal daily routine. This device has electrodes and electrical leads exactly like a regular EKG, but it has fewer leads. It can pick up not only your heart’s rate and rhythm but also when you feel chest pains or exhibit symptoms of an irregular heartbeat, or arrhythmia.
Holter monitor testing is also sometimes called ambulatory electrocardiography. There are other types of devices that can be used to measure heart activity for longer periods of time.

A Doppler ultrasound is a noninvasive test that can be used to estimate the blood flow through your blood vessels by bouncing high-frequency sound waves (ultrasound) off circulating red blood cells. A regular ultrasound uses sound waves to produce images, but can't show blood flow.

Fetal echocardiography (echo) uses sound waves to check the heart of your developing baby.

Fetal echo can help find heart defects before birth. If a heart problem can be found early, the more likely treatment will work. This is because:

• Healthcare providers may be able to treat the problem before birth, in some cases. 

• Healthcare providers can get ready for problems that may happen during labor and delivery. 

• An early delivery can be scheduled.

• Once the baby is born, treatment may be done. This might be medicine or surgery.

It is a diagnostic test which uses ultrasound waves to create an image of the heart muscle and show the size, shape and movement of the heart's valves and chambers as well as the blood flow through the heart.
Patients must bring all previous diagnostic or operative reports and films.

Pulmonary function tests (PFT) are conducted to assess the strength and functional efficiency of lungs along with the nature of air circulated in the respiratory system. These set of tests are highly important for patients who suffer from breathing problems, asthma and breathlessness.
Since a complete PFT routine involves a combination of departmental tests like chest X ray, blood gas analysis, breathing test and more. Patients are required to take certain easy measures to facilitate completion of the test.