Even after development of a severe mental disorder or brain dysfunction, reading scores on the may not deteriorate, so these scores may be used as a pre-morbid level of functioning.

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The WRAT-4 (Wide Range Achievement Test) is commonly used to assess pre-morbid level of functioning as it measures basic reading, spelling, and arithmetic skills that can be affected by cognitive impairments. The other options listed (MCAT, LSAT, and WAIS-IV) are not typically used for this purpose.

Even After Development of a Severe Mental Disorder or Brain