What is the term for the testing protocol that involves an initial short-term test followed by confirmatory testing as necessary?

The term that accurately describes the testing protocol involving an initial short-term test followed by confirmatory testing, if needed, is "Sequential." This approach allows for a quick assessment of radon levels in a property using a short-term test. If the initial results indicate elevated radon levels, it prompts the need for a more thorough follow-up, which may involve longer-term testing to confirm the findings. This sequence of testing is pivotal for ensuring accurate and reliable radon level assessments, as initial short-term tests can be influenced by temporary factors like weather conditions. Thus, the sequential method is designed to provide a clearer picture of a property's radon exposure over time before making decisions regarding mitigation or further actions.