The bottom line is you cannot have your employer attest to your results on their letterhead. You need to have a test that is a very clear type and attestation of the results. Thousands of cruisers, self included, have done this multiple times. It is available through Celebrity website and EMed. You state that you work in a physicians office. What part of this is not clear to you? Just move on from having your doctor employer or nurse provide an attestation. If you want to cruise take the test and provide the results as is clearly articulated by Celebrity and many cruisers!