The urinary system plays a vital role in filtering waste products from the blood while maintaining electrolyte and fluid balance. In dogs with cystinuria, the defective transport mechanism causes high levels of cystine to accumulate in urine. Over time, this can lead to the formation of cystine crystals and bladder or urethral stones, which may obstruct normal urine flow and cause discomfort or serious urinary complications.
Clinical signs of cystinuria usually appear in young to adult dogs, depending on the severity of the genetic mutation and stone formation. Early signs may include frequent urination, straining to urinate, blood in the urine (hematuria), or urinating in small amounts. Some dogs may show signs of discomfort, restlessness, or repeated attempts to urinate without success.
If urinary stones develop, they can cause partial or complete obstruction of the urinary tract, which is a medical emergency—especially in male dogs due to their narrower urethra. Affected dogs may experience severe pain, abdominal discomfort, and inability to pass urine. Without prompt treatment, urinary obstruction can lead to kidney damage or life-threatening complications.
The Cystinuria (CU) DNA Health Test is designed to detect the specific genetic mutation(s) that affect cystine transport in the kidneys. The test is simple, safe, and non-invasive, typically performed using a cheek swab or blood sample. The collected DNA is analyzed in a specialized laboratory to determine whether the dog carries zero, one, or two copies of the mutation responsible for cystinuria. Because genetic information remains unchanged throughout life, testing can be performed at any age, including before symptoms develop.
Results are generally reported as:
- Clear (Normal): The dog does not carry the cystinuria mutation and is not expected to develop inherited cystine stone disease.
- Carrier: The dog carries one copy of the mutation but typically does not show clinical signs; however, it can pass the mutation to offspring.
- Affected/At Risk: The dog carries two copies of the mutation and is at increased risk of developing cystine crystal formation and urinary stones.
Genetic testing for cystinuria is highly valuable for breeders, veterinarians, and dog owners. For breeders, it helps identify carriers and prevent carrier-to-carrier matings, significantly reducing the incidence of this painful urinary disorder in future generations while maintaining healthy genetic diversity.
For dog owners, early detection allows for preventive management. While cystinuria cannot be fully cured, it can often be controlled through dietary management, increased water intake, urine pH modification, and in some cases, medication to reduce cystine concentration. Regular veterinary monitoring is essential to detect crystals or stones early before they cause obstruction.
The Cystinuria (CU) Health Test is a reliable genetic screening tool that supports responsible breeding practices, early disease prevention, and improved urinary tract health and quality of life in dogs.
