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How to Read Your Child's IQ Test Report
A formal IQ test report can run to several pages of numbers, tables and technical language. Most of it comes down to a handful of concepts, and once you know what to look for, the report stops feeling like it was written in a different language altogether.
It helps to remember that these reports are written primarily to be useful to other professionals — teachers, other clinicians — as much as to parents, which is part of why the language can feel dense on a first read. Asking the psychologist to talk through the report page by page at the feedback appointment, rather than trying to decode it alone afterwards, is usually the most efficient way through it.
The composite score
The headline number, usually called the Full Scale IQ or similar, is set up so that 100 represents the exact average for a child of that age. Scores are designed to spread out in a predictable, bell-curve pattern around that midpoint, which is what makes the rest of the report interpretable at all.
Roughly two-thirds of children score somewhere between 85 and 115 on this kind of scale, simply because that's how the bell curve is built. A score outside that band isn't automatically a cause for concern or celebration on its own — it's the starting point for a conversation with the examiner, not the end of one.
Percentile rank
Alongside the composite score, most reports include a percentile rank, which says how a child compares directly with same-age peers. A score at the 75th percentile means the child scored as high as or higher than 75 percent of children their age in the comparison sample — often a far more intuitive way to grasp the result than the composite number alone.
Percentile rank and composite score can feel like they're saying different things at first glance, simply because the maths behind percentiles isn't a straight line — a small change in composite score near the middle of the curve shifts the percentile far less than the same-sized change out near either extreme. Reports sometimes include both for exactly this reason.
Confidence intervals
Reports also usually list a confidence interval, a range like "108 to 116," alongside the single score. This exists because no test is perfectly precise, and it reflects the fact that if the same child were tested again under similar conditions, the true score would very likely fall somewhere in that range. It's a useful reminder not to treat a single number as more exact than it really is.
Sub-test and index scores
Beneath the composite figure sit index scores for areas like verbal reasoning, visual-spatial reasoning, working memory and processing speed. A psychologist will often draw more practical conclusions from the pattern across these indexes — a notable gap between two areas, for instance — than from the single overall number, since that pattern often points more directly towards useful, specific support.
A large gap between the highest and lowest index score is sometimes flagged as a statistically unusual pattern in its own right, separate from whether any individual score is high or low. Reports will often note when this kind of gap is present, since it can be a useful clue even when every individual score, taken alone, looks unremarkable.
Qualitative observations
Many reports end with a section of written observations: how the child approached tasks, whether they seemed anxious, tired, or highly motivated, and any behaviour the examiner thought was worth noting. These notes provide context for the numbers and are worth reading just as carefully as the scores themselves, since they can explain an unusually low or high result in one particular area.
It's worth asking directly, at the feedback appointment, whether anything in the session seemed to affect the result — a cold, a bad night's sleep, or simple nerves. A conscientious examiner will usually flag this unprompted, but it's a fair question to raise if the report doesn't mention it and something about the day genuinely wasn't typical for your child.
Putting it all together
None of this needs to be memorised before a feedback session — a good psychologist will walk you through the report and answer questions about anything that isn't clear. If you tried a quick iq test for kids online before booking the formal assessment, it can help to compare the informal impression it gave you against the fuller picture in the report, though the two shouldn't be expected to line up precisely, since they're measuring the same broad idea with very different levels of precision. Reading the confidence interval and sub-test pattern together, rather than fixating on the single composite number, is usually the most useful habit to take away from a iq test for kids report, formal or informal.