Currently published anemia diagnostic indices are as follows: (1) red blood cells: RBC35; (2) Mentzer index(MI): MCV/RBC36; (3) Shine and Lal index(SL): MCV2*MCH *0.0137; (4) England and Fraser index(EF): MCV-RBC-(5 *Hb)−5.1938; (5) Srivastava index(S): MCH/RBC39; (6) Green and King index(GK): MCV2* RDW/(100 *Hb)40; (7) Red blood cell distribution width: RDW41, 42; (8) Red blood cell distribution width index(RDWI): MCV*RDW/RBC43;(9) Ricera index(R): RDW/RBC44; (10) Ehsani index(E): MCV-10*RBC45; (11) Sirdah index (Si): MCV-RBC-3*Hb46. Here, GSTM1 is linked to anemia (phenotype).