My whole view of this issue was warped when my friend's son who likewise was reading MTH chapter books at 5 tested not gifted. His mom pushed for the testing(he has an older sister who is gifted) thinking he was indeed gifted (incidentally her daughter who did test "gifted" was not reading chapter books at 5). I was floored when she told me the results came back and he was not in the gifted range. She said he is doing well where he is in school and is bright so she is fine with it and doesn't suspect any LDs or 2e issues.