When have you combed through large amounts of data in order to identify a specific set of information?

The job of a Medical Records Abstractor involves sorting through large amounts of data to identify specific sets of information. The interviewer wants to hear that you have the skills and experience that are required for the position. Describe a job you had during which you had to search through data to find a specific set of information, whether it was for a physician, insurance company, or patient.