This test tells us about the functional capacity of the lungs. We decide on alterations in the treatment of Asthma based on clinical review and objective values of lung function. Using a lung function test along with clinical examination for Asthma management is recommended as the global standard of care. We have state of the art, new technology Lung Oscillometry machine. This machine is very easy to use by the patients. We can test the lung function for younger Pediatric patient which is not possible by regular pulmonary function ( Spirometry) machines.