Originally Posted by
USMCFLYR
You keep talking about needing some base line IQ test. There is not a baseline test for an individual unless you choose to take one first and then keep having them, but that isn't the way they are generally used. Your baseline is the average of a large group of people who have taken the same test (the below article say based on your age group even) - so in this case you literally have millions of baselines on which they base your results.
https://www.verywellmind.com/what-is...age-iq-2795284
Depending on the test, they may also consider your performance on various portions of the test, relative to overall performance. A significantly lower score in one specific area may indicate a deficit, as different parts of the brain are used for different things.