The Wechsler Adult Intelligence Scale (WAIS) is a standardized IQ test administered to individuals ages 16 and older to measure cognitive ability and intellectual functioning. Licensed psychologists use it clinically to diagnose learning disabilities, intellectual disabilities, ADHD, and cognitive impairments, and to evaluate giftedness or neurological conditions.

The WAIS-IV is administered one-on-one by a trained psychologist in a quiet testing room, typically taking 60 to 90 minutes to complete. It consists of 10 core subtests and 5 supplemental subtests delivered verbally, visually, and through hands-on tasks like block design and puzzle completion.

The WAIS-IV generates four composite index scores: Verbal Comprehension Index (VCI), Perceptual Reasoning Index (PRI), Working Memory Index (WMI), and Processing Speed Index (PSI). These four indexes combine to produce a Full Scale IQ (FSIQ) score, with an average score of 100 and standard deviation of 15.

Core subtests include Similarities, Vocabulary, Information, Block Design, Matrix Reasoning, Visual Puzzles, Digit Span, Arithmetic, Symbol Search, and Coding. Supplemental subtests are Comprehension, Figure Weights, Picture Completion, Letter-Number Sequencing, and Cancellation, used as substitutes when core subtests cannot be administered.

The WAIS-IV is designed for individuals between 16 years and 90 years 11 months of age. It cannot be self-administered or purchased by the public, as it is restricted to qualified professionals such as licensed psychologists, school psychologists, and neuropsychologists who hold Level C testing credentials from Pearson Assessments.

You cannot register directly for the WAIS like a standard exam. Instead, you must schedule an appointment with a licensed clinical psychologist, neuropsychologist, or school psychologist who administers the test. Referrals often come from physicians, schools, or employers, and appointments can be booked through private practices, hospitals, or university clinics.

On the WAIS-IV, a Full Scale IQ score between 90 and 109 is classified as average, with 100 being the exact mean. Scores of 110-119 are high average, 120-129 superior, and 130+ very superior, while 80-89 is low average and below 70 indicates extremely low functioning.

Formal preparation for the WAIS is discouraged because coaching can invalidate results, which measure natural cognitive ability. However, you can optimize performance by getting adequate sleep the night before, eating a balanced meal, staying hydrated, managing test anxiety, and familiarizing yourself with the general subtest categories through practice questions.