What is the purpose of documenting retained body fluids/tissue samples?

• A. To store additional samples for future unrelated studies
• B. To reveal patient identities to all study staff
• C. To document location and identification of retained samples if assays need to be repeated
• D. To track inventory of all samples

Answer: (D)

Maintaining a clear inventory of retained samples is about accountability and traceability. When every sample has a unique identifier, a recorded storage location, and status information, the study team can reliably locate and manage the samples, ensure proper handling and storage, track how samples are used, and dispose of them correctly at study end. This comprehensive inventory supports any need for re-analysis, quality checks, or regulatory audits by showing exactly what exists, where it is, and how it has been handled.

While re-analysis might be a use case, the overarching purpose of documenting retained samples is to track the inventory of all samples. Options about sharing identities with all staff or storing extra samples for unrelated studies involve separate consent, policies, and protections, and are not the primary purpose of the documentation itself.