Ok, there aren't tests. That doesn't mean there aren't ways to assess this, though: Fatigue plagues many diseases, especially chronic diseases and especially au

Ok, there aren't tests. That doesn't mean there aren't ways to assess this, though: Fatigue plagues many diseases, especially chronic diseases and especially auto-immune disorders. Memory issues are similar, especially brain fog. We do have some measure of what is "normal" for most folks, and questions we can ask to assess this sort of thing. You ask things about getting through the work day, how far one can walk without taking a break or nap, if they can get housework done, if a shower means that a nap is soon to come. You ask about cooking, whether or not they are forgetting everyday stuff that the rest of us don't have much issue with, and other such things. It isn't like folks are complaining about being a little tired, but rather more like the sort of fatigue that means you have to take a break while chopping onions and you might have to recover after taking a shower. You might not get your housework done even if that's all you have to do.