1. NHS Sickle cell and thalassaemia programme standards.PHE publications gateway number 2016644 2017.
2. WHO Technical Report series 848.WHO expert committee on biological standardization. 44th report 1994.
3. WHO Reference Reagent.International reference reagent for Hb A2 NIBSC code:89/666 Instructions for use (Version3.0 Dated 04.04.2008). National Institute for Biological Standards and Control Potters Bar Hertfordshire EN6 3QG UK.
4. Evaluation of the suitability of the World Health Organisation International Reference Reagent for Hb A2 quantitation (89/666) for continued use;Dela Salle B;Int J Lab Haematol,2019
5. A whole blood control for blood count analysers and source material for an external quality assessment scheme;Reardon DM;Med Lab Sci,1991