Definitely call your vet. I am unsure about the connection between a urinalysis and kidney issues because a few weeks ago my elderly dog (15) urinated blood and we rushed him to the ER. Vet said that there was nothing in his urine, but that the blood was coming from either kidneys or liver. My regular vet confirmed that the next day and tried to explain to me that what is in the urine may not always be indicative of what is going on further up in the body.