My son was recently tested by his school psychologist. We received his scores, and no further information, which left us with several questions. After posting his scores on this forum and receiving lots of insightful information from aeh and polarbear, I knew which questions to ask of the school psychologist.
I'm not familiar with what is included in a detailed report, but if you don't have the option of talking with the psychologist after you get results, I would think the report could prove beneficial, especially if the scores aren't in line with what you expect.