Prevalence: what the data shows

The analysis, drawn from electronic health records across 420 UK first-opinion practices, reviewed CKD diagnoses in cats presenting between 2021 and 2026. The dataset covers approximately 890,000 cat consultations and represents one of the largest UK-specific feline CKD prevalence estimates published.

31%

of cats over 12 years have a recorded CKD diagnosis in the dataset

2.4 yrs

earlier average diagnosis in practices using routine SDMA testing from age 7

58%

of cats diagnosed at IRIS Stage 1–2 (early) vs 42% at Stage 3–4 (late/end-stage)

The SDMA difference

The study's most clinically significant finding is the impact of symmetric dimethylarginine (SDMA) testing on diagnosis timing. Practices that incorporated SDMA into their senior wellness panels from age 7 diagnosed CKD at an average of 2.4 years earlier than practices relying on creatinine alone.

Creatinine only rises measurably when approximately 75% of kidney function is lost. SDMA becomes elevated at around 25% loss, opening a window for intervention that creatinine misses. The IRIS (International Renal Interest Society) staging guidelines — the international standard for feline CKD management — formally incorporated SDMA into staging criteria from 2019, but adoption in routine wellness panels has been uneven.

Why earlier diagnosis matters

The key intervention that slows CKD progression — dietary phosphorus restriction via a prescription renal diet — is most effective when started early. The analysis found that cats diagnosed at IRIS Stage 1–2 and transitioned to a renal diet within 3 months of diagnosis survived a median of 3.1 years longer than stage-matched cats managed without dietary change.

This effect size is consistent with the randomised controlled trial evidence base: phosphorus restriction reduces tubular injury, slows the rate of nephron loss, and reduces the metabolic acidosis that accelerates kidney damage. Our CKD glossary entry covers the IRIS staging system and management steps at each stage.

The management gap

Despite the evidence for renal diet intervention, the analysis found only 44% of cats diagnosed with CKD at IRIS Stage 1–2 were transitioned to a prescription renal diet within 6 months. The most common barriers cited by vets were owner compliance with diet change (cat refusal or owner reluctance) and cost of prescription food.

Gradual transition to renal diet over 2–4 weeks substantially improves acceptance. Wet renal formulations are often more palatable than dry. Our cat hydration guide covers additional strategies for increasing water intake — critical in CKD management — and our routine check-up guide explains when bloodwork should be included in annual visits.

Key takeaways for owners

  • Request SDMA inclusion in senior bloodwork from age 7 — not all practices include it as standard
  • Increased thirst or urination at any age warrants a vet check, not watchful waiting
  • A CKD diagnosis is not an immediate end-of-life situation — early-stage cats can remain stable for years with management
  • Wet food and supplemental water sources (fountains) support kidney health regardless of CKD status