WHO reported that there were 356,955,803 confirmed cases of COVID-19 and 5,610,291 deaths worldwide as of January 26, 2022 [1]. Meanwhile in Indonesia as of January 26, 2022, there were 4,301,193 positive cases of COVID- 19 and 144,254 deaths had been determined by the Ministry of Health of the Republic of Indonesia and the North Sulawesi Provincial Health Office reported 34,786 positive cases and 1,046 deaths [2]. During the COVID-19 pandemic, based on case reports, there were COVID-19 patients whose blood glucose levels increased while undergoing treatment at the hospital, even though these patients had no history of Diabetes mellitus. The effect of COVID-19 on increasing blood sugar levels is still not fully understood. Currently, while COVID-19 is still spreading, there is a need for continuous improvement in knowledge about the effective management of blood sugar control during COVID-19 infection. The purpose of this study was to investigate the relationship between blood glucose levels and clinical outcomes of COVID-19 patients undergoing treatment at the hospital. This research is a retrospective analysis using medical record data of Covid-19 patients treated at Sentra Medika Minahasa Utara Hospital for the period of March 2021 to August 2021. The results showed a significant relationship between elevated blood sugar levels and poor clinical outcomes in COVID-19 patients.