Originally Posted by MumOfThree
Dude, on current IQ tests the tail is so compressed that 130 / 98th is usually considered the started if gifted (MG) while 138 / 99th is generally considered the start of HG and 145 / 99.9th is HG+/EG/PG (depending on who you speak to).

Minor correction: 135 is the 99th and 140 is slightly past the 99.6th on a test with a 15 point standard deviation (see this link). As has been noted here, people have different definitions of levels of giftedness. I tend to think of HG as the 140 mark, as it includes a minority (slightly less than 20%) of gifted people. Drawing the HG line at the 99th percentile would include the top half of gifties, which could also be a definition of HG, albeit more liberal.

The numbers are all kind of fuzzy anyway, and would presumably vary if you test the same person on different occasions.