I understand the concern about anxiety about their impending condition, but medical providers must not paternalistically decide to withhold a diagnosis from patients, at least not in all cases.

If I got an early diagnosis, it would motivate me to get my affairs in order to lessen the burden on my family and check off some bucket list items before it's too late. Don't rob me of that opportunity.

Before ordering the test, ask patients "If you were going to get Alzheimer's, would you want to know?"