Association between Hb A1c and Severity of COVID-19 Patients.

This study aimed to examine the relationship between Hb A1c levels and the clinical course of coronavirus-19 (COVID-19) patients. Sixty-six COVID-19(+) patients with high Hb A1c and 46 with average Hb A1c and 30 COVID-19(-) patients with average Hb A1c were included. Hb A1c levels and parameters examined in COVID-19(+) patients were compared between groups, and correlation analysis was performed between these parameters and Hb A1c levels. The effect of Hb A1c levels on intensive care unit (ICU) admission and mortality rate in COVID-19 patients was analyzed with the χ2 test. It was observed that hemoglobin (Hb) and arterial oxygen saturation (SaO2) levels of the COVID-19 (+) groups was lower than the COVID-19 (-) group, while ferritin, D-dimer, procalcitonin (PCT), and C-reactive protein (CRP) levels were higher. The COVID-19 (+) group with high Hb A1c had higher lactate dehydrogenase (LDH), PCT and D-dimer levels than the other two groups, while Hb, partial arterial oxygen pressure (PaO2) levels were lower. The Hb A1c levels of the COVID-19 (+) groups were positively correlated with absolute neutrophil count (ANC), LDH, PCT and (K+) levels, while negatively correlated with Hb and PaO2 levels. Hb A1c was found to be associated with the inflammation process, coagulation disorders and low PaO2 in COVID-19 patients. The COVID-19 patients with high Hb A1c levels had a higher mortality rate than other COVID-19 patients. Using Hb A1c measurements with other prognostic markers would contribute to the patient's risk of death assessment.