Br J Haematol. 2020 Aug 3. doi: 10.1111/bjh.17060. Online ahead of print.
COVID-19 is an infectious disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). COVID-19 is not only a lung disease but rather a systemic syndrome where blood alterations may play a key role (1). Severe cases show a marked variation in the red blood cell distribution width (2), which agrees well with reduced erythrocyte turnover and would function as a compensatory mechanism to maintain the circulating red blood cell and oxygen levels (3).