I have never taken an IQ test, but I have heard that EQ (emotional quotient) is fairly important too. I suspect that we who are labelled "ill", have a high EQ.

My T once said that the mental "illness" is when we are unable to function in the world, and not necessarily because of what we are going through in terms of symptoms. It's about how we react to symptoms that determines mental health.

I consider that a form of being gifted.

ETA: I couldn't resist, so I took an online IQ test from IQtest.net. I scored 142. I have no idea if this test is valid or not, but it came with tons of "special offers" that I had to refuse, so I suspect it is not valid.