A good IQ tester won't just give a single IQ number but a several page written report describing the findings, with sub-test as well as overall scores. Showing how a score is obtained may serve to demystify it. I do think my son should be able to read this report if he requests it, but I understand the logic of the people who disagree, especially for younger children.

"To see what is in front of one's nose needs a constant struggle." - George Orwell