It Costs About $30 and Most People Say No
Every year at Benny's checkup, our vet asks if we want to add a urinalysis. And every year for the first several years, I declined. Blood work? Sure. Vaccines? Of course. That urine test? "He seems fine, we'll skip it." I assumed it was an upsell. I was wrong, and I'm a little embarrassed about how wrong I was.
The urinalysis is arguably the most undervalued routine diagnostic test in veterinary medicine. It's inexpensive, non invasive, and provides information that blood work alone cannot. Yet most dog parents skip it because it doesn't seem important, or because nobody explained why it is.
What a Urinalysis Tells You That Blood Work Doesn't
Early Kidney Disease
Remember how kidney disease doesn't show up on blood work until 65% to 75% of function is lost? Urine specific gravity (a measure of how concentrated the urine is) can start showing changes much earlier. When the kidneys begin losing their ability to concentrate urine, specific gravity drops. This can happen while BUN and creatinine are still perfectly normal on blood work. A urinalysis catches what blood work misses.
Urinary Tract Infections
UTIs don't always cause obvious symptoms. Some dogs, especially older females, have subclinical infections that cause ongoing bladder inflammation and discomfort without dramatic signs like straining or blood in the urine. A urinalysis can detect bacteria, white blood cells, and blood that aren't visible to the naked eye.
Diabetes
Glucose in the urine is often the first lab confirmation of diabetes. While blood glucose is also diagnostic, it can be elevated by stress alone (a very common phenomenon in dogs at the vet). Glucose in the urine is a more specific finding because it only occurs when blood sugar has been consistently elevated enough to exceed the kidney's reabsorption threshold.
Protein Loss
Protein in the urine (proteinuria) indicates kidney damage. The urine protein to creatinine ratio (UPC) quantifies how much protein is being lost and is a sensitive marker for kidney injury. Some dogs with early glomerular disease (damage to the kidney's filtering units) lose protein in the urine as their only abnormality for months before other values change.
Bladder Crystals and Stones
Certain crystal types in the urine indicate a predisposition to bladder or kidney stones. Catching crystals before they form stones means dietary changes can prevent a painful and potentially surgical condition.
Liver Function
Bilirubin in the urine can indicate liver or red blood cell problems, sometimes before blood work shows changes.
Why It Gets Skipped
Three reasons, all understandable but all fixable:
- "It's an add on cost." At most practices, a urinalysis runs $25 to $50. For the diagnostic value it provides, this is extraordinarily inexpensive. A kidney disease diagnosis caught two years earlier through urinalysis versus blood work is worth thousands in avoided emergency costs and countless hours of quality life.
- "My dog seems fine." The whole point of screening tests is to find things before symptoms appear. Blood work gets this pass ("sure, let's check the blood even though she seems healthy") but urinalysis doesn't. They should be treated with the same urgency.
- "Collecting urine is weird." Fair. But your vet can collect a sterile sample via cystocentesis (a quick needle into the bladder, which sounds worse than it is and takes seconds) or you can catch a midstream sample at home with a clean container. It's a minor inconvenience for major information.
When to Start
I'd recommend adding a urinalysis to your dog's annual blood work starting at age five for large breeds and age seven for small breeds. For dogs with known risk factors (breed predisposition to kidney disease, history of UTIs, diabetes in the family line), earlier and more frequent testing is reasonable.
What to Ask For
A complete urinalysis includes:
- Specific gravity (kidney concentrating ability)
- pH (can indicate infection or certain metabolic conditions)
- Protein (kidney damage indicator)
- Glucose (diabetes screen)
- Bilirubin (liver/RBC indicator)
- Blood (can indicate infection, stones, or other urinary tract issues)
- White blood cells and bacteria (infection indicators)
- Crystal identification (stone risk assessment)
- Sediment examination (microscopic look at what's in the urine)
If protein is detected, ask about a UPC ratio for quantification. If the specific gravity is low, ask about SDMA testing on the blood work if it wasn't already included.
My Regret
When Benny was seven, I finally said yes to the urinalysis. It revealed mildly dilute urine (specific gravity 1.020, lower than the ideal range for a dog not on IV fluids) with a trace of protein. His blood work was completely normal. Our vet ran an SDMA, which came back slightly elevated. We caught kidney changes at the earliest possible stage. Dietary adjustments were made. Monitoring was established. At nine, his kidney values are stable and he's doing beautifully.
If I had kept skipping that $30 test, we might have caught those changes at age nine or ten instead of seven, at a stage where the options are fewer and the prognosis is different. Thirty dollars. That's what stood between early detection and late detection.
At your next vet visit, say yes to the urinalysis. Every time. It's the most important test most dog parents skip, and it might be the most valuable $30 you ever spend on your dog's health.
