Background: Identifying and treating patients with COVID-19 requires the use of quick and precise laboratory diagnostic techniques that assess the patient's health and identify the illness. Aim: This study was conducted to determine the relationship between hematological and biochemical parameters and length of hospitalization in patients with COVID-19. Methods: This is a cross-sectional study of a descriptive-analytical type, which was conducted by census method on 360 medical records of patients with COVID-19 in Imam Khomeini Hospital in Jiroft in 2022. Data were analyzed using descriptive and inferential statistics tests. Results: The average number of days of hospitalization in the present study was 4 days. The rate of COVID-19 was higher in men than in women. The most common underlying diseases in the patients were heart, pulmonary, and diabetes. Among the biochemical parameters, only lactate dehydrogenase (LDH), blood urea nitrogen (BUN), aspartate aminotransferase (AST), alanine transaminase (ALT), platelet (PLT), and erythrocyte sedimentation rate (ESR) parameters had a statistically significant relationship with the total length of hospitalization (P-value<0.001). LDH, AST, ALT, creatinine (Cr), creatine phosphokinase (CPK), blood sugar (BS), total bilirubin, and direct bilirubin parameters were higher than normal in hospitalized patients. Conclusion: The results showed that there is a relationship between LDH, BUN, AST, ALT, PLT, and ESR parameters and the length of hospitalization of patients. The levels of LDH, AST, ALT, Cr, CPK, BS, total bilirubin, and direct bilirubin parameters in patients were higher than normal.
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