The Hb level was low in different patients with SARS-CoV-2 with multiple disease conditions of IHD with DM, DM with HTN, MI with HTN, and MI and DM 11.00 ± 1.34, 11.69 ± 1.35, 11.16 ± 1.40, and 11.83 ± 1.53 g/dL, respectively. Here, GSTM1 is linked to diabetes mellitus.