Figure 2 Different diagnostic methods currently in use for COVID-19. Nucleic acid-based RT-PCR is the most commonly used technique to detect SARS-CoV-2 infection. Serological methods like antigen assays are also used, however they are not as accurate as of the RT-PCR method. Computer Tomography (CT) scan is also generally advised to patients along with an RT-PCR test to confirm COVID-19 infection. The electrochemical sensor-based technique is relatively new and with further development, it can be brought into use.