Glycosylated hemoglobin is a biomarker with a central role in the diagnosis and follow-up of patients with diabetes.[22] A study pointed that inflammations markers such as C reactive protein (CRP) level, serum ferritin level, and erythrocyte sedimentation rate (ESR) in COVID-19 cases were positively correlated with glycosylated hemoglobin, while SaO2 was negatively correlated with glycosylated hemoglobin,[13] suggesting glycosylated hemoglobin test after admission is helpful for assessing inflammation, hypercoagulability and prognosis. Here, CRP is linked to COVID-19.