To the Editor: Coronavirus disease 2019 (COVID-19) has been associated with a range of hematologic findings and complications [1]. We have encountered three cases of significant methemoglobinemia, and five cases… Click to show full abstract
To the Editor: Coronavirus disease 2019 (COVID-19) has been associated with a range of hematologic findings and complications [1]. We have encountered three cases of significant methemoglobinemia, and five cases of relatively mild methemoglobinemia, among patients being treated for COVID-19 in our health system during a 4 week period in April 2020. For comparison, there was only one case of mild acquired methemoglobinemia of any cause documented in our health system during the preceding year. Below we describe the three cases of significant methemoglobinemia, including their presentations, treatments, and outcomes.
               
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