You probably already know this, but I should add that re-importing does have the downside that not everything gets exported from a study, so there are things you would have to recreate, such as the specimen request settings. The way to understand what you will need to recreate is to look at the page we display when exporting a study (with lots of check boxes). Anything not listed there is (probably) not exported. Of course, you can also look in the study archive and see what is there and figure it out from there.

Good luck.

Dave