Sachdev et al. recently reported age and sex-specific Hb cutoffs to define anemia in children in India 1–19 y of age using data from the 2016 India Comprehensive National Nutrition Survey and applying a similar approach as current WHO Hb cutoffs using the lowest 5% of Hb distribution in a presumably healthy subpopulation of those sampled. The gene discussed is GSTM1; the disease is anemia (phenotype).