MCV: mean corpuscular volume; TIBC: total iron-binding capacity; PR: pulse rate; SBP: systolic blood pressure; DBP: diastolic blood pressure; Hb: hemoglobin; RBS: random blood sugar; HbA1C: glycosylated hemoglobin; IDA: iron deficiency anemia. The gene discussed is GSTM1; the disease is Iron deficiency anemia.