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ISD Scotland better information, better decisions, better health

Data Quality Assurance

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NHS National Services Scotland ISD Scotland & NHS National Services Scotland

How we Work

Diagram of how we work

Information Flow and Coding:

What is coding?

Coding is the translation of clinical terminology into an (alpha) numeric code to make it easier to analyse data for management and epidemiological purposes. By supporting the process of collecting better quality information through accurate coding we contribute to the decisions that inform health care policy which ultimately leads to improvements in patient health.

For further information on coding please see Information Flow and Coding from Hospital Clinicians This file is available to download or view online Download PDF file [1.34mb].

Measuring Accuracy

DQA assess the quality of recording in a sample of records against source evidence in hospital systems and patient casenotes. Each data item is assessed and, if discrepancies in recording are identified, assigned an error type. More information on error types can be found - Error Type Definitions.

Data is analysed and results produced for reporting. ISD have a 90% standard for accuracy and recording of data.


The “Confidentiality Rules for ISD Scotland Staff” are applied in the handling of all patient identifiable data. Supplementary to these rules, the team have their own procedures/rules designed to cover work in hospitals. In addition, the team will adhere to all hospital confidentiality procedures/rules.


© ISD Scotland 2010
Information Services Division,
NHS National Services Scotland,
Gyle Square,
1 South Gyle Crescent,
Edinburgh EH12 9EB,
Tel: 0131 275 7050  
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Working at the very heart of the health service, NSS delivers services critical to frontline patient care and in support of the efficient and effective operation of NHS Scotland. Visit the NSS Website for more information