What type of audit determines if a facility has submitted all required cases?

The correct answer is a casefinding audit. This type of audit focuses on the identification and reporting of all eligible cancer cases that a facility is required to submit to a cancer registry. It assesses whether the facility has effectively identified all patients with reportable cancers within a specific timeframe, ensuring comprehensive data collection.

In a casefinding audit, the emphasis is on the processes and systems that are in place for detecting and recording cases, which may involve reviewing medical records and other documentation to ensure that the registry captures all necessary information. This type of audit is crucial for maintaining data completeness, which is essential for accurate cancer statistics and research purposes.

The other options may relate to different aspects of auditing within a cancer registry context. For instance, a facility audit often focuses on the administrative processes and compliance of the facility itself, while a lost case audit specifically investigates cases that have been missed or not accounted for in the registry. A registry audit typically involves a broader review of the registry's overall performance and data quality, rather than a specific focus on casefinding. Therefore, for the purpose of assessing the completeness of case submissions by a facility, a casefinding audit is the most appropriate choice.