Is it ethical for psychologists and psychometricians to lie to their clients

Read another response by Miriam Solomon
Read another response about Ethics, Medicine
Is it ethical for psychologists and psychometricians to lie to their clients about their IQ if it protects them from harm to their self-esteem? I ask because I highly suspect that such a practice is both very common and something that has been practiced on me. I am told I have an IQ of a 138 which to me seems highly improbable given my academic record and my SAT scores, but I always wanted to join Mensa and I think i told my tester that. However when I applied for Mensa I had to have my records sent three times to their headquarters but each time they somehow got "lost" and so I never became an official member. It also seems improbable that so many people I have known have IQs higher than 150, it's like it's just very common for practitioners to give their clients high feel good numbers.