At the end of the study, we hope that the results will bring some clarification on the role of Hb and serum ferritin in the diagnosis of iron deficiency in pregnancy and that allows us to question the paradigm that “the prevalence of iron deficiency anemia in a population is statistical rather than physiological concept” (WHO, 2001) [1]. The gene discussed is GSTM1; the disease is Iron deficiency anemia.