If your administrators aren't sure what you're looking for, you can ask specifically for some common tests, such as Otis-Lennon, Otis-Gamma, Stanford Binet, or Woodcock-Johnson.

Regarding whether or not your childhood score is accurate, Alan S. Kaufman, clinical professor of psychology at the Yale University School of Medicine says,

There's no such thing as "an" IQ. You have an IQ at a given point in time. That IQ has built-in error. It's not like stepping on a scale to determine how much you weigh.

The reasonable error around any reliable IQ is going to be plus or minus 5 or 6 points, to give you a 95 percent confidence interval. So, for example, if a person scores 126, then you can say with 95 percent confidence that the person's true IQ is somewhere between 120 and 132; within our science we don't get any more accurate than that.

But as soon as you go to a different IQ test, then the range is even wider, because different IQ tests measure slightly different things.

But while there is no single IQ – it's a range of IQs – you can still pretty much determine whether a person is going to score roughly at a low level, or an average level, or a high level.

However, IQ is a relative concept. IQ is how well you do on an IQ test compared to other people your age, and that is true whether you are 4 or in your 40s.