A 55-year-old woman presents with a 6-month history of poor memory and impaired concentration. She has bipolar I disorder that has been treated with lithium carbonate for 4 years. She has gained a lot of weight since starting lithium. Physical examination findings are otherwise normal. She is concerned about her memory issues, but there are no other perception, mood, or cognition abnormalities. Which one of the following tests is most likely to have abnormal findings?
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