Once a participant has been created, it's not possible to modify the participant id.
It is possible to export the data that has been collected for this participant id, then create a new participant ID and import the collected data into the new participant id, following the steps below.
Please note that it is only possible to import study and repeating data; it is not possible to import survey data, comments, or queries.
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Export the data of the participant in .csv format.
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Unzip the file.
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Create a new participant with the correct participant id.
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Import study data.
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Upon importing, select the file that contains study data. It will look like 'STUDYNAME_export_DATE.csv'.
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Import repeating data.
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Repeating data is saved in separate files. For example, SAE repeating data is stored in the file 'STUDYNAME_SAE_DATE.csv', and repeated blood pressure measurements are stored in the file 'STUDYNAME_Blood_pressure_DATE.csv'. You will have to import every repeating data instance separately.
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Delete/archive the 'old' participant with the incorrect record ID.
Once the data is imported to the corrected ID, the old participant ID may be archived or deleted.
Castor Support can also assist with renaming participant ids for studies that are live and collecting data and there is a large number of records that need to be modified.
- If you would like to change the participant ID for a record that has been randomized, please contact support@castoredc.com indicating the study ID, original participant ID and new participant ID.
- If you would like to reuse the same ID later in the study, Castor Support can enable (upon request) a feature to allow the reuse of participant IDs; however, this may have a negative impact in case Automations are used.
More on this in the following article: Introduction to the Automation Engine