Knowing that I have to check Edith periodically for Ketones, I'm wondering if I should buy a Blood Ketone Meter instead of using the urine sticks. I already purchases the Ketostix at Walmart but my problem is catching her tinkle when I'm not home all day. I read about the different options of filling the litter box with non absorbent substrate, Aquarium gravel i.e (already bought some, washed it and dried it, ready to go) But - then I read that the urine collected for testing should be as fresh as possible? Well, I wouldn't know when she tinkled if I'm not at home. So, my novice thinking about this situation is to test her blood for Ketones? If this is a good idea, what meters would you recommend? There are multiple out there.