The predictive role of blood indices in coronavirus disease 2019 (COVID-19) related in-hospital adverse outcomes and post-recovery status is not fully defined . The main aim was to assess the association of complete blood indices measured at baseline with COVID-19 related in-hospital clinical outcomes, including length of hospital and intensive care unit (ICU) stay, receiving mechanical ventilation, degree of lung injury and in-hospital death, and post-recovery status . This retrospective study included patients with newly diagnosed COVID-19 infection from August 20, to September 25 , 2020 . The initial study cohort included 127 patients with newly diagnosed COVID-19 . Of whom 26 patients were excluded, leaving 101 patients for final analysis . low lymphocytes% [Odds ratio and confidence intervals = OR (CI) ] [0.2 (0.0-0.2, p=0.03] increased the odds of ICU stay length while high platelet mean volume (PMV) [0.9 (1.1-5, p <0.00], high platelet distribution width (PDW) [0.3 (0.4-1.9), p <0.00], and low lymphocytes% [0.2 (0.0-0.2), p=0.02] increased the odds of length of hospital stay . Decreased lymphocytes% showed significant independent association with increased risk for mechanical ventilation use [0.9 (0.9-1), p=0.04], extensive degree of lung injury [0.2 (0.1-0.7), p <0.00], and in-hospital death [0.5 (0.3-0.8), p=0.01]. High lymphocytes% [0.9 (0.9-1), p <0.00] and high PMV [0.3 (0.3-0.8), p=0.02] were significantly associated with complete recovery while increased neutrophil% [1 (1-1.1), p=0.04] was associated with increased risk for post recovery fatigue . In conclusion, low lymphocytes% and high neutrophil% are useful markers for predicting adverse in-hospital outcome and post-recovery persistent fatigue, respectively . High PMV and lymphocyte% showed significant association with favorable short-term prognosis.