Low-dose aspirin (LDA) is widely prescribed to reduce the risk of preeclampsia (PE), yet its effects on haemoglobin (Hb) levels and anaemia risk are poorly characterised.<h4>Methods</h4>This scoping review mapped available evidence on the association between LDA use and Hb concentration or anaemia outcomes in pregnant women. The gene discussed is GSTM1; the disease is preeclampsia.