Even with this infrequent monitoring, Division of AIDS (DAIDS) [20] Grade 3 anemia (hemoglobin [Hb] < 7.5 g/dL) was observed in 46 cases (29% of those tested), and Grade 4 anemia (Hb < 6.5g/dL) was observed in 27 cases (17% of those tested). Here, GSTM1 is linked to anemia (phenotype).