COVID-19 patients with diabetes had a higher level of fasting plasma glucose (P ≤ 0.001), D-dimer (P ≤ 0.001), white blood cells (P = 0.011), total bilirubin (P = 0.030), and blood urea nitrogen (P = 0.022) and lower level of oxygen saturation (P ≤ 0.001), lymphocyte (P = 0.036), and albumin (P = 0.002). The gene discussed is ALB; the disease is diabetes mellitus.