Well, there's always a reason they COULD reject your report!
Is the question whether you can do the work to demonstrate compliance to 60601 versus having a test lab do it? The short answer is yes, you can do it; however, if not done by an accredited lab then they will likely charge you more for review time and lengthen the review to scrutinize the data and ensure it meets the same criteria as an accredited lab would provide.
If that wasn't the gist of your question, please clarify.