I read frequently of tests that are being developed for AD. Blood tests, skin IR spectrogram tests, etc. At the same time I read frequently of people that claim they have determined the real cause of AD and surprisingly all of them are different.
There is a lot of research being done on AD, AD causes, AD tests, AD biomarkers and the like. There is a huge amount of money to be made in the AD space for anything that proves to be useful.