Splenectomy is an operation to remove the spleen. The spleen is a non-essential organ that has some function in the haematological (blood-forming) system of the body, and in the development of the immune system. Its function is more important in children, and less so in adults. Splenectomy is most commonly performed for disorders of haematological system. This can be done open or laparoscopically ("key hole"). We commonly recommend specific vaccinations before or after splenectomy.