ECG (Electrocardiography)-it is based on the principle of electrical impulses generated and propagated by cardiac system which is represented by spike waves, it is the most common test to find functions of the various parts of Heart being the primary test for Heart abnormalities.
It can be done anytime no preparation is required.

Echocardiography (ECHO)-which is available for pediatric, fetal (unborn) and adult patient it is to see the size and function of various valves and valve in it and with the advent of color Doppler the function of the heart can be assessed properly particularly if suspecting heart problem.

Stress Echocardiography (Stress ECHO) and Dubatamine stress test (DST) - it is done by two ways either by physical stress by moving on treadmill also known as TMT (treadmill test) or by chemical stimulation by injection Dubatamine known as Dubatamine stress test. It is used for testing the Heart’s condition to tolerate the stress factor.

PFT (Pulmonary function test)- based on the principle of movement of gases and occupation of space the pulmonary function are recorded as wave form which can predict the functioning of lungs in various pathological condition particularly for obstructive lung disease.
No preparation is required.