Blood analyses showed microcytic, normochromic anemia (9.9 g/dL Hb, mean cell volume of 73 fL, and 32.6 g/dL mean corpuscular hemoglobin) due to iron deficiency, a normal white cell count (13.6 G/L leukocytes, 4.98 G/L neutrophil granulocytes, 0.11 G/L eosinophil granulocytes, 0.0 G/L basophil granulocytes, 7.18 G/L lymphocytes, and 1.33 G/L monocytes), normal ionogram and transaminases levels, and normal thyroid hormonal levels, but an elevated protein level (87 g/L) with hypoalbuminemia (28 g/L) and elevated IgM (7.38 g/L) and IgG (29.9 g/L) levels. The gene discussed is GSTM1; the disease is Iron deficiency anemia.