By The OpenKidsPrep Editorial Team
The Wechsler Intelligence Scale for Children, Fifth Edition (WISC-V) is the most widely used individually administered IQ test for children ages 6–16. When a psychologist tests your child for giftedness, learning disabilities, or twice-exceptionality, it's most likely the WISC-V they're using. The score report contains multiple numbers — here's what each one means.
The Full Scale IQ (FSIQ)
The FSIQ is the single composite score that summarizes overall cognitive ability. It's derived from 10 of the test's core subtests, spanning five cognitive domains. The FSIQ is scaled to a mean of 100 and a standard deviation of 15. This means:
- FSIQ 100 = exactly average for the child's age
- FSIQ 115 = one standard deviation above average (84th percentile)
- FSIQ 130 = two standard deviations above average (98th percentile)
- FSIQ 145 = three standard deviations above average (99.9th percentile)
WISC-V Score Classification Table
| FSIQ Range | Classification | Percentile Range |
|---|---|---|
| 145–160 | Very Superior | 99.9th+ |
| 130–144 | Very Superior (Gifted) | 98th–99.9th |
| 120–129 | Superior (Gifted eligible) | 91st–97th |
| 110–119 | High Average | 75th–90th |
| 90–109 | Average | 25th–73rd |
| 80–89 | Low Average | 9th–24th |
| 70–79 | Borderline | 2nd–8th |
| Below 70 | Extremely Low | Below 2nd |
The Five Composite Indexes
Beyond the FSIQ, the WISC-V produces five Primary Index Scores — each measuring a distinct cognitive domain. These are also IQ-scale scores (mean 100, SD 15):
- Verbal Comprehension Index (VCI): Measures verbal reasoning, vocabulary, and the ability to understand and express ideas in words.
- Visual Spatial Index (VSI): Measures the ability to analyze and synthesize visual-spatial information — understanding shapes, space, and visual relationships.
- Fluid Reasoning Index (FRI): Measures inductive and deductive reasoning using nonverbal and verbal stimuli. This is often considered the "pure intelligence" measure.
- Working Memory Index (WMI): Measures the ability to hold and manipulate information in short-term memory — crucial for math, reading comprehension, and following directions.
- Processing Speed Index (PSI): Measures the speed and accuracy of processing simple visual information. Slow processing speed can mask otherwise high ability.
What Score Qualifies as Gifted?
Most gifted programs using the WISC-V set the cutoff at FSIQ 130 (98th percentile) — the traditional two-standard-deviations-above-average threshold. Some programs use FSIQ 125 or 120.
Importantly, some psychologists and programs also consider high index scores even when the FSIQ is lower. A child with a VCI of 140 and a PSI of 100 may have an FSIQ of 122 — but their verbal reasoning ability is in the profoundly gifted range. This is why profile interpretation matters, not just the composite score.
Twice-Exceptional Children
Some children have both gifted-level ability and a learning disability or ADHD. These "twice-exceptional" (2e) children may have uneven profiles — a very high VCI with a low WMI, for example. In these cases, the FSIQ may significantly underestimate the child's intellectual ceiling. Gifted programs increasingly look at individual index scores rather than requiring a uniformly high FSIQ.
Can Scores Change?
WISC-V scores are relatively stable but not fixed. Children who are retested (typically after 2+ years) may score differently due to practice effects, development, medication changes, or environmental factors. IQ scores tend to stabilize more as children approach adolescence. A score from age 6 is less predictive of later ability than a score from age 10.
Practice WISC-V Style Questions Free
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Start practicing free →After the WISC-V: Using the Score Report Effectively
When you receive your child's WISC-V score report, the Full Scale IQ (FSIQ) is the headline number — but the five Index scores are often more actionable. A child with an FSIQ of 125 who has a Verbal Comprehension Index of 140 but a Processing Speed Index of 105 has a very different cognitive profile than a child with FSIQ 125 and all five indexes clustered between 120 and 130. The first child has a significant strength and relative weakness; the second shows consistent performance across all domains.
The Ability-Achievement Discrepancy is one of the most clinically useful analyses that can be done with WISC-V data. This compares WISC-V index scores to scores on achievement tests (such as the ITBS or MAP) to identify children who are performing significantly below what their cognitive ability would predict. This discrepancy pattern is one of the diagnostic criteria for learning disabilities and is the reason many psychologists administer an achievement test alongside the WISC-V in a comprehensive evaluation.
Score confidence intervals matter and are often overlooked. A WISC-V FSIQ of 128 has a 95% confidence interval of roughly 123–133 — meaning the score that best represents your child's "true" ability lies somewhere in that range, not necessarily at exactly 128. When program cutoffs fall within a confidence interval, the evaluating psychologist can document this in their report, which sometimes provides grounds for a program eligibility discussion that a raw score alone would not.
If your child's scores feel inconsistent with what you observe at home or school, share that observation with the evaluating psychologist. WISC-V scores can be affected by testing anxiety, rapport with the examiner, fatigue during a long session, and physical factors like illness. An experienced psychologist will note these in their report and qualify the score interpretation accordingly.