Hematological analysis and hemoglobin electrophoresis revealed a mild anemia α0‐thalassemia trait (Hb 90 g/L, MCV 71 fL, and MCH 22.7 pg) compound with β+‐thalassemia trait (MCV 71 fL, MCH 22.7 pg, and HbA2 5.51%) for the pregnant woman. Here, GSTM1 is linked to anemia (phenotype).