A Dynamed summary on diabetes mellitus type 2 states that conditions affecting red blood cell lifespan may alter HbA1c levels [3]. HbA1c is decreased (falsely low) with conditions that shorten red blood cell lifespan such as acute or chronic blood loss, haemolysis, sickle cell anaemia, thalassaemias and hereditary spherocytosis [3]. However, HbA1c is increased with conditions that increase red blood cell lifespan such as iron deficiency anaemia, vitamin B12 deficiency, folate deficiency anaemia or splenectomy [3].