GSTM1 and COVID-19: Increased levels of AST, LDH, ferritin, ESR, BS, urea, D-dimer, and ALP were evident in COPD patients with COVID-19 at admission, whereas the levels of other laboratory tests were within the normal range, such as WBC, Hb, Hct, PT, PTT, Plt, INR, Na, K, and ALT (Table 1).