Guidelines for the diagnosis, investigation and management of polycythaemia/erythrocytosis.

Department of Haematology, Queen’s University, Belfast, Belfast City Hospital, Belfast, Department of Haematology, City Hospital, Birmingham, Department of Haematology, University of Cambridge, Cambridge Institute for Medical Research, Cambridge, Department of Haematology, St Thomas’ Hospital, London, Department of Haematology, Royal Bournemouth Hospital, Bournemouth, Sleep and Ventilation Service, Department of Respiratory Medicine, Royal Brompton Hospital, London, Department of Haematology, Royal Hallamshire Hospital, Sheffield, Consultant Paediatric Cardiologist, Guy’s Hospital, St Thomas Street, London, Department of Clinical Haematology, Manchester Royal Infirmary, Manchester, and Cellular Pathology Department, Royal Victoria Infirmary, Newcastle upon Tyne, UK