One example of that is in the follow‐up haemoglobin monitoring recommended as part of the algorithm for management of children with severe anaemia (at 24 and 48 h following initial haemoglobin test for children who receive a blood transfusion, and at these time points plus one at 8 h for children with uncomplicated severe anaemia (Hb 4–6 g/dL) who do not receive an immediate transfusion [9]). The gene discussed is GSTM1; the disease is anemia.