title: Monitoring access to nationally commissioned services in England.
abstract: BACKGROUND
  For over 20 years, the National Health Service in England has run a system of national planning for highly specialised healthcare services. The aim is to ensure that very rare diseases are treated, and very complex procedures performed, in only a few centres, each of which maintains a volume high enough to maintain excellent outcomes. The commissioning strategy for the provision of these national services in England is strongly centralising. Centralising does however create a duty to ensure that patients distant from the treatment centres are not thereby disadvantaged. The commissioning process ensures sufficient capacity to treat the entire national caseload of clinically eligible patients. The aim of this paper is to apply the Systematic Component of Variation (SCV) to study access to services commissioned by the National Specialised Commissioning Team (NSCT) in England. The discussion focuses on the potential explanations for a high level of systematic variation between areas and on the use of the SCV to support the monitoring and development of these nationally commissioned services.
  
  
  METHODS
  Data from nationally commissioned services for the year ending 2011 were received from treating hospital. Mid year age and sex appropriate population estimates were then obtained to provide denominator data. Data were analysed at the geographic level of strategic health authority.
  
  
  RESULTS
  30 services met all requirements for analysis. There is no apparent relationship between SCV and number of locations from which the service is provided. On inspection high SCV is more common among recently commissioned services.
  
  
  CONCLUSIONS
  The importance of the SCV lies in its ability to support the development of highly specialised services. Once the random variation has been accounted for, the reasons for a systematic component can be explored. While no absolute cut- off exists, the SCV can be used to gauge and explore services that are potentially not covering the national caseload. The reason for a high SCV may not be immediately apparent; thus the SCV can aid those responsible for commissioning the service to seek potential explanations and identify improvements.
  
  
  CONCLUSIONS
  We have reviewed spatial variation in access to a set of highly specialised services in England. On inspecting our results, we believe that they suggest that equity of access can usually be achieved at about five years after establishing a service, and this is not dependent, within the geography of England, on the number of centres designated.
authors.affiliation: National Specialised Commissioning Team, 2nd Floor Southside 105 Victoria Street, London, SW1E 6QT, UK.
authors.forename: Suzanne
authors.initials: S
authors.lastname: Coles
authors.forename: Kate
authors.initials: K
authors.lastname: Haire
authors.forename: Tom
authors.initials: T
authors.lastname: Kenny
authors.forename: Edmund G
authors.initials: EG
authors.lastname: Jessop
mesh_terms: D003695:Delivery of Health Care / Q000458:organization & administration*; D004739:England; D006297:Health Services Accessibility; D006801:Humans; D013222:State Medicine