Original handwritten records must be kept to reconstruct which of the following?

• A. Proficiency test samples
• B. Initial demonstration of capability (IDOC)
• C. Demonstration of continued proficiency (DOC)
• D. All of the above

Answer: (D)

Keeping original handwritten records is essential because they provide an authentic, verifiable trail of what happened during testing. This trail is needed to reconstruct proficiency test samples, the initial demonstration of capability, and the demonstration of continued proficiency. Each of these activities relies on an unaltered record that captures details like dates and times, who performed the work, reagent and instrument information, and the results. If only digital copies or summarized notes are kept, important details can be lost or changed, making it hard to verify performance during audits or investigations. So, preserving the original handwritten records covers all these areas, which is why the option that includes all of the above is correct.