You can view a history of all transactions performed against patient profiles either by performing a search as described in Searching for Patient Profiles or by performing a Transaction History search on the History page (described in Viewing a Patient's Transaction History). You can trace the events that modified a patient profile from the time the profile was added to the master index application up to the most previous transaction, including merged and deactivated profiles.
The Transaction History page allows you to view a side-by-side comparison of one patient profile before and after a transaction occurred against that profile. Like the Comparison page, the Transaction History page displays an EUID tree for each profile, from which you can select the type of information you want to compare with differences between the two profiles highlighted. For a true comparison, be sure the type of information you are viewing is the same on both sides of the page. You can also compare an SBR against an SBR, an SBR against a system record, or a system record against a system record. From associated Transaction History pages, you can unmerge previously merged profiles.