The MOST commonly used IQ test in the United States is the:

Question

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The WAIS-IV, or Wechsler Adult Intelligence Scale, Fourth Edition, is the most commonly used IQ test in the United States. This is likely because it is a comprehensive test, assessing a range of cognitive abilities in addition to IQ, and it is commonly used for clinical and research purposes. While the Stanford-Binet Intelligence Scale and Terman Intelligence Battery were both historically significant tests, they are less commonly used today. The Spearman g Scale is not an IQ test, but rather a theory of intelligence that suggests a general intelligence factor underlies all cognitive abilities.

The MOST Commonly Used IQ Test in the United States