A 71-year-old retired engineer presents with his wife, who reports he has been forgetting appointments and repeating questions over the past 6 months. He scored 26 out of 30 on the Mini-Mental State Examination (MMSE) administered by his primary care provider, which was interpreted as normal. His wife insists the cognitive changes are real and progressive. The PMHNP is deciding which additional cognitive screening is most appropriate. What is the best assessment approach?