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Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is still a global concern with high morbidity and mortality rates. The role of endothelial cells in the progress of COVID-19 is well established. Therefore, the current study aimed to measure the endothelial markers and their correlation with the hematological parameters in intensive care unit-admitted COVID-19 patients. This study involved 111 adult participants, including 55 ICU-admitted patients with COVID-19 and 56 healthy controls. Levels of E-selectin, ICAM-1, and VCAM-1 in the plasma of the study participants were measured and correlated with hematological parameters. The study demonstrates that COVID-19 patients admitted to the ICU have higher levels of E-selectin, ICAM-1, and VCAM-1 compared to healthy controls (p <.05). These elevated levels can serve as reliable indicators of endothelial dysfunction and early markers for the detection and prediction of endothelial cell involvement in COVID-19 complications. The findings of this study suggest that increased levels of E-selectin, VCAM-1, and ICAM-1 in patients with COVID-19 are indicative of the participation of endothelial cells in the pathogenesis of COVID-19 complications. Consequently, these endothelial markers are proposed as potential early indicators for predicting the severity of COVID-19. [ABSTRACT FROM AUTHOR]