record linkage

record linkage
the means by which information about health events from several different sources (e.g. hospital attendance, vaccination, and consultation with general practitioners) are all related to a specific individual in a common file or more usually a computerized record. This contrasts with data in which events only are recorded (see Hospital In-patient Enquiry) and two separate individuals treated for the same disease cannot be distinguished from one individual treated on two separate occasions.

Medical dictionary. 2011.

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