So what we might take from all of this is the child who is tested young, by a gifted specialist, because they seem gifted (but have not been coached) is more likely to come up with a stable-ish number than a child tested randomly by a general tester or a child tested after much early coaching.

So when people with gifted seeming kids are asking whether to take their child for testing, what sort of test (SB5, WPPSI, wait for the WISC), with who... the reasonable answer is?