Data quality of HES

Information about the quality and completeness of HES data is readily available on this website. When HES is published, additional data quality information and explanatory notes are also made available. These can be found in the relevant areas of the Accessing the data section.

For HES system users and those requesting extracts, data quality notes are published highlighting any specific issues with the data to be aware of.

For more information on the quality of provisional monthly HES data specifically, see the Monthly HES data page.

Outpatient data quality is investigated in detail on the Outpatient reports page

Other articles on data quality can be found in the Topic papers section.