Classifying and cleaning clinical research interview transcripts before encryption

Treat pseudonymization as risk reduction

Names are not the only identifiers. Locations, occupations, rare events and combined details can still point to a participant.

Find unnecessary personal data, duplicates and unprotected temp files before vaulting pseudonymized transcript storage

Protect the code key separately

A transcript and its re-identification key should not travel or rest together. Restrict the key to approved roles and document access.

1. 01Mark direct identifiers before analysis begins.
2. 02Review combinations of age, occupation, location, dates, relationships and unusual events.
3. 03Generalize or suppress detail only when the approved analytic purpose can still be met.
4. 04Create a version label that distinguishes raw, pseudonymized and disclosure-ready text.
5. 05Have an authorized second reviewer check high-risk passages before sharing.

Leave evidence another custodian can follow

Record the de-identification method, reviewer, version, unresolved indirect identifiers and permitted audience. Do not describe a transcript as anonymous when a key or realistic re-identification route remains.

Pause and review when

• A reader from the participant community could readily infer the speaker.
• Free-text notes contain contact details or names not covered by the first pass.
• The code key is available to the same people receiving the transcript.

Encryption does not decide permitted research use

Does not replace provider permissions, guaranteed backup, password recovery or enterprise identity management. Pseudonymized data can remain sensitive, especially when indirect identifiers or a usable code key exist. Technical protection must sit inside the approved research workflow rather than replace it.

Questions to resolve before acting