Elevated kidney enzymes.

I brought my dog, Trixie (10 year old Shih Tzu) in this morning for her yearly dental cleaning. The vet always does blood tests beforehand to make sure that her organs are functioning properly. The vet called after the blood test results were configured, and he said that Trixie's kidney enzyme levels indicated that the procedure would not be safe. When I picked Trixie up, the vet gave me a print out of her results.

The abnormal levels are as follows:
-LaserCyte heading on the blood results:
--->PLT = low at 111 K/μL (normal range 175-500)

-Catalyst heading on the blood results:
--->BUN = high at 38 mg/dL (normal range 7-27)
--->CREA = high at 2.9 mg/dL (normal range 0.5-1.8)
--->GLOB = high at 4.7 g/dL (normal 2.5-4.5)
--->CI = low at 107 mmol/L (norman range 109-122)

Everything else indicates a normal range. I am very worried about my dog. The vet told me that the results indicate that Trixie's kidneys are functioning at only 25% and that she would eventually succumb to kidney failure. He said that I could schedule an ultrasound to determine if the problem is treatable, but he was not optimistic.

Trixie was not allowed to have anything to eat after 6 p.m. last night, so when I returned home from work at 5:45, I gave her some tuna. Trixie is a very picky eater and always has been, so I knew I wouldn't be able to get her to eat her dog food within the 15 minutes that I had to get her to eat before she had to begin fasting. She also had two chicken jerky dog treats. That is the last thing that she had to eat before she began fasting.

The last time Trixie's blood work was done was one year ago, and all of her results were normal. I'm just shocked that she can have such a grim prognosis when she seems fine. She seems healthy and fine. She isn't having any trouble going to the bathroom, although she did have diarrhea about a month ago. She isn't urinating more or less frequently that I have noticed.

My questions are these: does this test result mean that Trixie is definitely on her way to kidney failure? Could this just be a fluke result? What can I do to keep my baby around longer? I'm just devastated right now. My vet was very helpful and compassionate, but he just seemed to think there was no hope for her. I just don't see how that's possible when she is still so active and she seems to be acting just like she always has.

Afterthought: Trixie has a lump in her upper abdomen (close to her ribcage in the center of her belly) that appears to be a hernia. She developed it about a year and a half ago. It seems to have gotten slightly bigger in the last 3-4 months. The vet didn't seem worried about it at her last checkup in May. I don't have any specific questions about this, I just didn't know if it would help you in evaluating the current situation with her kidneys.

Thank you for your time.

-Melissa

My vet did not do any tests on her urine. Is this something that I should get done soon? My dog is acting fine. Her appetite and bathroom habits have not changed at all that I have noticed.