CD40LG and COVID-19: While rapid techniques such as loop-mediated isothermal amplification (LAMP) or rapid IgG/IgM testing may prove useful, such tests tend to suffer from a combination of unreliability and unavailability.1,16,17 the study’s aim was to identify, in ED patients who were undergoing COVID-19 testing, triage-assessable factors that could be used to stratify the risk of positive COVID-19 results.