[The role of thoracic CT scan, a triage tool for suspected COVID-19 cases].

The SARS-Cov-2 pandemic took health care players across the world by surprise, including caregivers, managers and logisticians. In the absence of a vaccine or a specific therapy, detecting the disease at an early stage and isolating confirmed cases from the rest of the healthy population was soon considered to be essential. The RT-PCR technique was the gold standard method for testing for infection with the virus. It has high specificity but moderate sensitivity. It was difficult to access it during the first weeks of the pandemic. On the basis of the observations of the Chinese and Italian scientific community in particular, the recommendation was to combine use of the RT-PCR with a low-dose thoracic CT scan. In the absence of easy access to the RT-PCR, the use of the lung CT scan for a rapid triage of patients within emergency departments proved effective.