Megan - Since CAP does not offer an automated DAT survey (as far as I know), my suggestion would be a variation of the #2 option in your list:
1. Perform your regular manual proficiency testing on the CAP-DAT Survey samples (and report your results to CAP.)
2. Then perform the DAT testing on the CAP-DAT Survey samples on your Echo instrument.
3. Don't submit your Echo results to CAP. Rather, keep the results in a file. When you get the results report from CAP, compare the report with your Echo results, document whether your Echo results were satisfactory, and have your Pathologist Medical Director sign and date this (and return it to your file.)
Donna