IQ scores stabilize after age 16 and may be considered current indefinitely unless
there is inconsistency with current functioning or an intervening injury or insult
has since occurred that would affect the IQ score. If the individual is retested after
age 16 and administered the same test, the score should not demonstrate much variance.
When the CPD and current evidence include IQ scores from the same test (e.g., the
WISC-IV) medical improvement (MI) may occur in the individual's intellectual disorder
(or related cognitive disorder) only if:
Improvement in IQ scores exceeds one standard error of measurement (SEM) and cannot
be reasonably accounted for by the practice effect (DI 24583.055F.2.) or another confounding variable, and
The medical or psychological consultant (MC/PC) finds the remaining evidence (including
evidence related to adaptive functioning) consistent with a decrease in medical severity.