IQ testing for children (Wechsler WISC): what it measures and when your child needs it

Many parents ask about an "IQ test" for their child, sometimes because the school asked for it, sometimes for reassurance. An IQ test is very useful in the right place, but it is not a verdict on a child’s future and cannot explain their difficulties on its own.

What is the WISC?

At the center we use the Wechsler Intelligence Scale for Children (WISC), one of the most widely used standardised intelligence tests in the world, given from about age 6 to 16. It doesn’t give just one number; it measures several abilities, including verbal comprehension, reasoning, visual-spatial skills, working memory and processing speed.

For adults we use the adult version: the Wechsler Adult Intelligence Scale (WAIS).

When is the test useful?

• When there is a clear gap between what the child seems to understand and their school level (a possible learning difficulty).
• To pinpoint strengths and weaknesses before building an individualized education plan.
• When general developmental delay, or giftedness that needs different support, is suspected.
• When the school requests it for inclusion or accommodation decisions.

What the score means — and doesn’t

The score compares the child’s performance with peers of the same age on the day of testing. It is affected by tiredness, anxiety, language and attention, so a specialist reads it alongside observation and developmental history. The number alone doesn’t define the child’s ability to learn; what matters is the detailed profile of each ability and what we build on it.

How to prepare your child

• Good sleep and a light snack before the appointment.
• Tell them it’s "games and questions", not an exam to pass or fail.
• Bring any previous school or medical reports.
• Don’t try to coach them on test questions; that spoils the result’s accuracy.

At the center, an IQ test is part of the comprehensive assessment when the child needs it, and we explain the results in a meeting with a written report and practical recommendations.