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1. There is no REDCap API to fetch changes in data that have occurred in a project since a given time point. The API always responds with ‘ALL changes’. The custom PHP plugin solves the problem by implementing an API that provides options like time point from when the changes need to be picked, how many changes, etc.

2. For longitudinal projects, the REDCap events API does not provide event IDs. It poses a problem in enforcing mapping between REDCap and OpenSpecimen events when there is a change in the REDCap event name (including unique_event_name). The custom PHP plugin implements an API to export project events along with their IDs. The OpenSpecimen plugin then uses these event IDs to create events mapping between REDCap and OpenSpecimen. The event IDs remain the same even when there is a change of event name. Significantly, data change records fetched from REDCap contain references to event ID.

Synchronization Run

If PHI is marked as "Disabled", can record matching occur on MRN or DOB or Name ?

Ans: If "Save PHI data" is set to "Disabled," record matching can still occur on fields like MRN, eMPI, External Subj ID, etc if the mapping is added to participant identifier fields. OpenSpecimen will prioritize the participant mapping over the "Save PHI data" setting, ignoring the "Disabled" option for the mapped fields and performing record matching based on the identifiers.

How are visits synchronized between REDCap and OpenSpecimen?

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