Alzenheimer diagnosis

Hi, I have a father who suffer from Alzheimer’s disease.I am curious to know something about how doctor diagnose that sickness step by step?

Ok, I will try to explain this thing to you.First of all,we can’t be certain in this.Because we can diagnose the disease with 80 or 90 percent success.I would ask a person about his general health,then about any possible problems that he is suffering when he is doing his everyday duties.I think that I would talk with the person’s family to get more information. Of course there should be some standard blood and urin tests.In some cases I would order a test of sample of spinal fluid.That is about it.