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The case report form (CRF) is the correct choice as it is specifically designed to record all pertinent data regarding each participant in a clinical trial, including their exposure to the experimental products being studied. The CRF captures detailed information such as dosing information, timing of administration, and any adverse events experienced during the study. This documentation is crucial for the analysis of the data generated during the trial and to ensure that all regulatory requirements are met.

In contrast, the consent form is focused on informing participants about the study and obtaining their permission to participate, but it does not detail individual exposure to the treatment. The billing statement typically relates to the costs incurred during the trial, rather than recording study-related data. The final study report summarizes the outcomes and findings of the study as a whole and does not capture individual subject data directly related to their exposure to the experimental product. Therefore, the case report form is the essential tool for recording exposure during a clinical study.