When planning changes to solutions on a new automated stainer, the frequency of changes should be based on

• A. The Stains Being Used
• B. The Color Of The Slides
• C. Based On Slides Stained
• D. A Fixed Schedule

Answer: (C)

On an automated stainer, when to change solutions should be driven by actual usage and performance, not by a fixed schedule. The reagents are consumed during runs and can deteriorate or become contaminated over time, so the best guide is how many slides have been stained with a given solution and how those slides look. Track the number of slides processed with each solution and monitor staining quality, including completeness, contrast, and background. If results stay consistent, you can extend the interval; if you begin to see fading, increased background, or inconsistent staining, that signals it’s time to replace the solution. This approach ensures you maintain reliable staining without unnecessary waste. The color of the slides is not a deciding factor, and following a rigid fixed schedule ignores real-world variation in workload and reagent stability.