According to the CKD stages of the COVID-19 patients, statistically significant differences were determined in respect of age (p < 0.001), hospitalization time (p < 0.001), ICU hospitalization (p < 0.001), hypertension (p < 0.001), diabetes mellitus (p < 0.001), acute kidney injury(AKI) (p < 0.001), mortality (p < 0.001), LDH (p = 0.01), CRP (p < 0.001), ferritin (p = 0.02), d-dimer (p < 0.001), white cell count (p = 0.01), lymphocyte count (p < 0.001), hemoglobin (p < 0.001) and platelets (p = 0.04) levels. The gene discussed is CRP; the disease is diabetes mellitus.