Overdependence on Rapid Antigen Test is a key factor for rise in critical illnesses due to Covid-19. Physicians say many people get tested using the RAT kits that give results quickly but have lower accuracy rate. In the last 7 days, Delhi has conducted more than 3.4 lakh Covid tests. Of this, 34% was done using RT-PCR while the rest using RAT kits. A decision was taken to double the state's testing capacity during a meeting on the Covid-19 crisis on Sunday. Further augmentation in the RT-PCR testing capacity may require increased manpower, infrastructure and space, which isn't easy.