If you’re considering having your child’s intelligence tested, you likely have questions: When is testing appropriate? Where do you go? What do the results actually mean? As a psychometrician who has spent years studying cognitive assessment instruments, here is what every parent should know before, during, and after the testing process.
When Should You Consider IQ Testing?
IQ testing for children is most commonly pursued for three reasons: gifted program identification (most programs require a score of 120-130+), learning disability evaluation (to determine if academic struggles reflect a cognitive deficit or other factors), and educational planning (to help teachers and parents understand a child’s learning profile).
Testing is generally not recommended before age 4, as scores are less stable at younger ages. By age 6-8, IQ scores become more reliable predictors of long-term cognitive trajectory. Testing is most useful when there is a specific question to answer — “Why is my child struggling with reading despite seeming bright?” or “Would my child benefit from gifted programming?” — rather than as a general curiosity exercise.
Which Tests Are Used for Children?
The most widely used individual IQ tests for children are:
Wechsler Intelligence Scale for Children (WISC-V) — for ages 6-16. The gold standard in clinical and educational settings. Produces a Full Scale IQ and five primary index scores: Verbal Comprehension, Visual Spatial, Fluid Reasoning, Working Memory, and Processing Speed. Administration takes approximately 65-80 minutes.
Wechsler Preschool and Primary Scale of Intelligence (WPPSI-IV) — for ages 2:6 to 7:7. Similar structure to the WISC but with age-appropriate tasks. Shorter administration time (30-60 minutes depending on age).
Stanford-Binet Intelligence Scales, Fifth Edition (SB5) — for ages 2-85+. Particularly useful at the extremes of ability (very high or very low IQ) due to extended score ranges. Produces a Full Scale IQ and Nonverbal/Verbal IQ composites.
Kaufman Assessment Battery for Children (KABC-II) — for ages 3-18. Provides an alternative theoretical framework (CHC or Luria model) and is designed to minimize cultural and language bias.
What Happens During Testing?
A standard cognitive assessment session involves a trained psychologist or psychometrist working one-on-one with your child in a quiet room. The examiner presents tasks that progress from easy to difficult: solving puzzles, defining words, repeating number sequences, identifying patterns, and completing timed activities.
The session typically lasts 60-90 minutes for school-age children, with breaks as needed. Younger children may require shorter sessions spread over two visits. Children are not expected to answer every question correctly — the test is designed so that items become too difficult for everyone at some point. This is normal and expected.
Most children actually enjoy the testing experience. The tasks are varied and engaging, and the one-on-one attention from a skilled examiner creates a positive dynamic. Anxiety is more common in parents than in children.
Understanding the Scores
IQ scores follow a normal distribution with a mean of 100 and standard deviation of 15. Here is what different ranges indicate:
130+ (Very Superior / Gifted): Top 2%. Significantly above average in most or all cognitive domains. Qualifies for most gifted programs.
120-129 (Superior): Top 3-9%. Well above average. May qualify for gifted programs with additional criteria.
110-119 (High Average): Top 9-25%. Above average but within the normal range.
90-109 (Average): Middle 50%. The majority of children score in this range.
80-89 (Low Average): Bottom 9-25%. Below average but within normal limits.
70-79 (Borderline): Bottom 3-9%. May indicate need for additional support.
Below 70 (Extremely Low): Bottom 2%. May indicate intellectual disability; further evaluation needed.
Equally important are the confidence intervals reported with every score. An IQ of 112 with a 95% confidence interval of 107-117 means you can be 95% confident the true score falls within that range. Never interpret a single number without considering measurement error.
What IQ Scores Don’t Tell You
IQ tests measure a specific set of cognitive abilities under specific conditions. They do not measure creativity, emotional intelligence, motivation, resilience, social skills, musical talent, athletic ability, or moral character. A child with an IQ of 100 may outperform a child with an IQ of 130 in school if the first child has better study habits, stronger motivation, and a supportive home environment.
IQ scores also reflect a snapshot in time. While scores are relatively stable after age 8 (test-retest correlations of 0.85-0.95), meaningful changes can occur — particularly in response to significant environmental changes, educational interventions, or health events. Retesting every 2-3 years may be appropriate if circumstances change significantly.
Where to Get Your Child Tested
Cognitive testing can be obtained through several channels: school psychologists (free through the school district if your child is being evaluated for special education services), private psychologists (typical cost: $500-$3,000 for a comprehensive evaluation), or university training clinics (reduced-cost testing by supervised graduate students). Ask whether the examiner uses current test editions (WISC-V, not WISC-IV) and request a comprehensive report with recommendations, not just a score summary.
Frequently Asked Questions
At what age can you test a child’s IQ?
Children can be tested as young as 2.5 years using the WPPSI-IV, but scores are more reliable and stable from age 6 onward. For gifted identification purposes, many experts recommend waiting until age 6-8 unless there is a compelling reason to test earlier.
How much does an IQ test for a child cost?
Through the public school system, cognitive testing is free when part of a special education evaluation. Private evaluations typically cost $500-$3,000 depending on the comprehensiveness of the assessment and geographic location. University training clinics often offer reduced-cost options ($200-$500).
