My wife has been diagnosed (originally) with mild dementia, verified by two doctors. She recently got results of blood tests an all 3(?) we’re out of range. P-tau was very high indicating likelihood of Alzheimer’s. Her Gerontologist said some of her patients have it done but most don’t and it wouldn’t change her treatment plan. I’ve read some reports that say p-tau can find things in the blood before it would show up in a amyloid PET. My wife thinks she might like to get it just to see if it shows anything the P-tau didn’t pickup but she really hasn’t made up her mind. Would it be worthwhile to get the PET that may or may not show anything additional?