system
Given the following post, respond as if you're commenting on Reddit:
human
Is there a test to determine one is at risk for Alzheimer’s or if one is in early stages?

If someone has a family history of Alzheimer’s, is there a test that can tell them if they are at risk to get?

Also, are there tests to determine if one is in early stages before symptoms are more pronounced?

Edit: Thanks to each one of you for sparing time and thought to respond. I gained a lot of knowledge as well as perspective from your replies. Have decided to approach a doctor for establishing baseline for current cognitive ability and repeat every year to check if there is a decline. 
Thanks again!
gpt
No, full stop.

Because the cause(s) of Alzheimer's are not understood there is no reliable test and in fact Alzheimer's is typically only diagnosed with certainty after death. Modern imaging adds some extra certainty for living patients but diagnosis can only be done for someone actively experiencing symptoms. This is because diagnostic markers that appear in people with Alzheimer's also appear in those without the disease so early diagnosis is extremely questionable at best and downright dishonest at worst. Genetic screens are not going to be a reliable way to assess your risk with any true accuracy for the same reason.

Sorry to deny you certainty on something so scary but don't let you self fall for snake oil in the name of false comfort.