If you were in the process of conducting a mental status exam, and you determine the patient has considerable problems with experiencing a range of...

If you were in the process of conducting a mental status exam, and you determine the patient has considerable problems with experiencing a range of manic symptoms and impulsivity...Why would you not have the patient do an intelligence or memory test. Why would the symptoms of mania and impulsivity contribute to an inaccurate assessment of the person's overall intelligence?