GSTM1 and anemia (phenotype): Anaemia contributes significantly to the morbidity and mortality of a population.1,4,5 Appropriate diagnosis and treatment is imperative, and tests that are commonly used in the diagnostic work-up of anaemia, such as haemoglobin (Hb) and serum ferritin, are readily available.6 Despite this, identifying and treating iron deficiency anaemia (IDA) can be challenging, partly because ferritin can be elevated in inflammation.