GSTM1 and anemia (phenotype): Numerous studies and reviews have attempted to establish transfusion triggersfor patients with anemia by evaluating two strategies: “restrictive”(usually Hb < 7.0 g/dL) and “liberal” (usually Hb ≥ 7.0g/dL).548-551 Most meta-analysesincluded perioperative patients of various natures: critical and clinicalpatients, as well as adults and children.