When validating a protocol change, what outcome indicates successful validation?

• A. Increased cost
• B. Staining pattern and intensity remain consistent with reference controls
• C. Decreased information gained
• D. Longer duration with no change in results

Answer: (B)

When validating a protocol change, you’re looking for evidence that the test performance remains equivalent to what’s already proven. In QIHC, the clearest signal of successful validation is that the staining pattern and the intensity match those of reference controls. If the changes you made do not alter where the signal appears in the tissue or how strong it is, you can trust that the protocol still detects the target reliably and reproducibly. This shows the modification didn’t compromise key aspects like antigen retrieval, antibody binding, or detection.

In contrast, options that indicate higher cost, less information gained, or a longer procedure without any improvement don’t reflect successful validation, since they point to inefficiency or degraded usefulness rather than maintained performance.