ABSTRACT
In present scenario respiratory diseases are major challenge in healthcare sector and many individuals suffer from respiratory diseases like asthma, lung cancer, throat cancer etc., due to air pollution, smoking and infections in respiratory system. Sometimes the respiratory diseases will become pandemic diseases such as SARS and COVID-19. In order to protect people from these pandemic diseases, detecting the diseases at earlier stage is much essential by proper diagnosis. The two diagnostic techniques are the invasive and non-invasive techniques. Diagnostic equipment like Computed Tomography (CT), Biomarkers and Artificial Electronic Nose are generally used in hospitals, however these methods are not affordable for common people. This paper reviews various invasive and non-invasive techniques and also tries to analyze cost effective device for diagnosing respiratory diseases. © 2019 SERSC.