CATS · Condition guide
Chronic kidney disease in cats: real veterinary cases
Chronic kidney disease is extraordinarily common in older cats — by some estimates one in three cats over 12 is affected. Early signs are subtle: gradual weight loss, slightly increased thirst, a less glossy coat, smaller appetite. By the time owners notice anything dramatic (vomiting, hiding, bad breath), the disease is usually well established.
There's no cure, but there is excellent disease-modifying care. The International Renal Interest Society (IRIS) staging system guides treatment: a renal diet, blood pressure control, phosphate binders, and managing concurrent diseases like hyperthyroidism can extend good-quality life by years. Early detection — via SDMA on routine senior bloodwork — is the single biggest opportunity to make a difference.
What vets typically check for
- CBC + chemistry + SDMA + urinalysis with USG; check urine protein:creatinine ratio.
- Stage by IRIS criteria (creatinine, SDMA, USG, proteinuria, blood pressure).
- Blood pressure measurement — feline CKD frequently causes systemic hypertension.
- Renal diet (low-phosphorus, restricted high-quality protein) is the single most evidence-supported intervention.
- Manage phosphorus (binders), potassium (often low), nausea, and any concurrent hyperthyroidism.
Not a replacement for veterinary care. Use this to walk into the conversation prepared, not to self-diagnose.
Real cases from the veterinary literature
Peer-reviewed reports our semantic search surfaces for Chronic kidney disease in cats. Click into any case for the full abstract — or run a personalised search with your pet's exact details.
- Type II retrocaval ureter causing hydronephrosis in a cat: case report
Arquivo Brasileiro de Medicina Veterinária e Zootecnia · BR
A 4-year-old male mixed breed cat was brought in with severe swelling of the right kidney, known as hydronephrosis, which was found during an abdominal ultrasound. The vet discovered that the cat's ureter was abnormally positioned behind a major blood vessel, which was likely causing the swelling. To treat this issue, the vet performed surgery to remove the affected kidney and
- Evaluation of symmetric dimethylarginine in cats using a point-of-care analyzer and commercial laboratory assay: limitations in chronic kidney disease staging.
American journal of veterinary research · 2026 · Australia
A study looked at how well two different tests (VCheck and Eurolyser) measure a substance called symmetric dimethylarginine (SDMA) in cats with chronic kidney disease (CKD). SDMA levels help vets determine the stage of CKD, but the results from these tests didn't match up well with a more established test (IDEXX). While both VCheck and Eurolyser showed some agreement with the I
- Circulating renin-angiotensin-aldosterone system markers in cats with non-hypertensive chronic kidney disease or systemic arterial hypertension.
Journal of veterinary internal medicine · 2026 · United States
A group of cats with chronic kidney disease (CKD) and high blood pressure (hypertension) were studied to see how their bodies produced certain hormones related to blood pressure and kidney function. The researchers found that cats with untreated hypertension had lower levels of specific hormones compared to healthy cats. When these hypertensive cats were treated with amlodipine
- Association between PCV and degree of azotemia with serum hepcidin concentration in cats with chronic kidney disease.
Journal of veterinary internal medicine · 2026 · United Kingdom
A group of 100 cats with chronic kidney disease (CKD) were studied to understand the relationship between a protein called hepcidin and anemia, a common issue in these cats. The research found that cats with anemia had higher levels of hepcidin compared to those with normal or slightly low red blood cell counts. This suggests that once anemia develops in CKD cats, hepcidin leve
- EXPRESS: Prevalence of the AIM exon 3 duplication variant, a putative biomarker associated with progression of kidney disease, in 1,000 cats.
Journal of feline medicine and surgery · 2026 · United States
A study found that about 20% of cats have a genetic variant that may increase their risk of chronic kidney disease (CKD). This variant affects a protein called AIM, which helps clear waste from the kidneys. Researchers analyzed DNA from 1,000 cats and discovered that nearly half had one copy of the variant, while one in five had two copies. This genetic change was not limited t
- Clinical outcomes and association with disease progression and survival of subclinical bacteriuria in cats with chronic kidney disease: a multicenter retrospective study.
Journal of veterinary internal medicine · 2026 · France
A study looked at 287 cats with chronic kidney disease (CKD) and found that having subclinical bacteriuria (SBU), which means bacteria in the urine without symptoms, did not affect how long the cats lived or how quickly their kidney disease progressed. Most of the cats with SBU were treated with antibiotics, but this did not stop the bacteria from coming back or lead to better
Frequently asked questions
- Will fluids at home help?
- In IRIS stage 3-4 disease where the cat can't keep up with fluid losses, daily or every-other-day subcutaneous fluids at home are a cornerstone of care. They can dramatically improve quality of life and many cats tolerate them well after a brief learning curve.
- Is a renal diet really worth it?
- Yes — it's the only intervention with strong evidence for extending survival in CKD cats. The biggest hurdle is getting cats to actually eat it; veterinary renal diets now come in many flavours and forms (dry, wet, pâté, stew) for exactly this reason.
- What's the prognosis?
- Highly variable and depends on IRIS stage at diagnosis. Many stage 2 cats live 3+ years with appropriate management. Stage 4 cats usually have months. Frequent monitoring (every 3-6 months) lets you catch problems while they're still fixable.