Which of the following is not a basic requirement for toxicity tests?

In toxicity testing, the fundamental requirements ensure the reliability and validity of test results. Among these requirements, using appropriate test organisms, establishing a test duration, and accurately measuring endpoints are essential for providing accurate and reproducible data.

When it comes to control test organisms, while documenting their reuse can be important for understanding variability and quality control over time, it is not a basic requirement for conducting toxicity tests. The key focus is on using organisms that are suited for the specific type of test and adhering to design standards, rather than focusing on the historical use of control organisms themselves. Therefore, the re-use of control test organisms is not deemed essential in every test situation, making it an option that does not qualify as a basic requirement for toxicity testing.