According to the Prevention and Control Program for Severe Thalassemia, the national screening criteria for suspected α0-thalassemia carriers involves using a cut-off point of MCV < 80 fL, DCIP negative, and Hb pattern presented with only Hb A and Hb A2 < 3.5%15,16. The gene discussed is GSTM1; the disease is thalassemia.