Don't know the answer to the first question. As to the second, yes they have discounted diabetes, Cushings and more illnesses and conditions that I can remember! He was drinking a lot, but that is caused by the dilute urine, kidneys inability concentrate his urine so as to return water to his bloodstream, hence slight dehydration, hence drinking more! He's now on the antibiotics in case of a low grade, undetectable urine, bladder or kidney infection, and I have to get some more urine samples when they are finished. Still weeing copious amounts very frequently, so I suspect that things wont change much, we shall see.