Which statement correctly describes IDOC timing?

• A. IDOC is required only when a new analyst joins
• B. IDOC must be completed only after a method change
• C. IDOC is optional if the method has been used in the last 12 months
• D. IDOC must be completed before using any method or when there is a change in instrument type, personnel, or method

Answer: (D)

IDOC timing is about documenting and approving any change that could affect test results before those results are produced. You complete IDOC before using a method so you know the current setup, instrument performance, and acceptance criteria are aligned with how the method will actually run.

This process is triggered whenever there’s a change in instrument type, personnel, or method. If anything about the hardware, the procedure, or who’s operating it changes, you need to capture and validate that change to ensure results remain reliable and traceable. It also ensures the new operator is trained and that the method has been appropriately reviewed for the new configuration.

So this approach ensures readiness and compliance before work begins, not just in response to a single type of change or after a long period of use. The other statements are too narrow or imply optionality, whereas IDOC timing requires pre-use documentation whenever changes occur.