ID- S.ferritin <12 mg/L;  Anemia - Hb<120 g/L;  IDA – Hb <120 g/L, S.ferritin <12 mg/L or Hb <120 g/L,  S.ferritin >12 mg/L,  sTfR >24.5 mmol/L. The gene discussed is GSTM1; the disease is anemia.