IL6 and COVID-19: We recommend considering the incorporation of laboratory tests such as ferritin, erythrocyte sedimentation rate (ESR), C-reactive protein (CRP), lactate dehydrogenase (LDH), D-dimer, and interleukin (IL)-6 into the initial evaluation as, while these studies are not yet validated in this setting, they may help differentiate between potential diagnoses, and they are often being incorporated into the workup of COVID-19 in clinical practice [37].