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To be useful in preventing future error, a root cause analysis (RCA) should be performed

  1. At least 45 days after the event

  2. Documenting opinion as well as facts

  3. Using practitioners who were not involved in the event

  4. Utilizing a multidisciplinary team

The correct answer is: At least 45 days after the event

A root cause analysis (RCA) should be performed as soon as possible after the event to accurately assess and identify the underlying causes of the error. Waiting at least 45 days may result in important details being forgotten or overlooked. Documenting opinions as well as facts may introduce subjective bias, and using practitioners who were not involved in the event may result in a lack of understanding of the situation. Utilizing a multidisciplinary team allows for a comprehensive analysis and different perspectives, but it is not the most important factor in conducting a successful RCA. Ultimately, timeliness and accurate information are crucial in preventing future errors.