Research report
A research report is the sourced material a domain
dossier is synthesized from — generated on a plan and a cadence, one topic per file.
A report carries no confidence tags. Its bracketed markers say who might have
an incentive to shade a line; none of them says anyone checked it. To reach a score, a line has
to be drafted onto a candidate as unverified and pass the Verifier or the
Corroborator, like everything else.
Section epidemiology · Version 2026-09-01 · Cadence annual · Evidence class 2 published · Sources 6 · Supersedes none
Domain: feline-ckd-subcutaneous-fluid-therapy · Scope: Public primary sources via connectors, WebSearch and WebFetch, per this manifest row's scope note. Excludes CPT descriptors, veterinary datasets requiring a commercial license (VetCompass US access, the Veterinary Medical Database, AVMA member-survey microdata, Banfield/Mars State of Pet Health raw data), fda.gov guidance documents and case law, anything behind an unset PATENTSVIEW_API_KEY, and non-US/EU jurisdictions — no US federal dataset covers veterinary population, prevalence, or procedure-volume data at all, which is the structural reason this section leans on peer-reviewed cohort and primary-care studies rather than a registry.
Sourcing: Rests entirely on peer-reviewed veterinary literature — five cohort/primary-care/case-control studies plus one consensus guideline — none of which is a US-representative, population-level prevalence or incidence study, and none of which establishes a trend direction over time; every quantity below is a single-study figure specific to the population it was drawn from.
Feline chronic kidney disease (CKD) is repeatedly described as one of the most commonly diagnosed conditions in aged cats, a statement independently corroborated by a veterinary consensus guideline and a peer-reviewed epidemiology analysis [5][6]. Reported prevalence figures vary by roughly an order of magnitude depending entirely on which population was sampled: 1.2% across a UK primary-care caseload of 353,448 cats [2], 8.1% across a Romanian university teaching-hospital caseload of 1,485 cats [5], and 50–68.8% in two smaller, non-representative research-recruited cohorts [1]. No study located this pass establishes a current, general-population, US-representative prevalence or incidence figure, and no study located reports a trend direction — rising, falling, or flat — for CKD prevalence or incidence over time, in the US or elsewhere. A UK primary-care cohort study identifies CKD as the most frequent cause of death in cats over five years of age and reports a median survival of 388 days after diagnosis [2]. Diagnostic under-recognition is itself a quantified finding in a US prospective screening study: the large majority of cats found to have previously unrecognized CKD showed no owner-reported symptom change beforehand [4].
_Baseline (v1). No prior version; this establishes the starting point for future diffs._
Four studies located this pass each report a materially different prevalence figure, and none is a substitute for the others because each drew from a differently constructed population.
Marino et al. (2014) reports CKD prevalence of 50% in a cohort randomly selected across four age bands (6 months–20 years) and 68.8% in a separate cohort originally recruited for degenerative joint disease (DJD) studies: "The prevalence of CKD in the RS and DJD groups was higher than expected at 50% and 68.8%, respectively" [1]. The retrieved abstract does not itself state a country of origin, so no jurisdiction is claimed for this figure. The same abstract adds a detail relevant to age distribution: "CKD was common in cats between 1 and 15 years of age, with a similar prevalence of CKD stages 1 and 2 across age groups" [1] — i.e., early-stage disease was not confined to the oldest animals in either cohort. [single-source]
O'Neill et al. (2019), a VetCompass primary-care study, reports a far lower prevalence in a much larger, general primary-care population: "From 353,448 cats attending 244 clinics, the prevalence of CKD was estimated as 1.2 per cent (95 per cent CI 1.1 per cent to 1.3 per cent)" across UK practices, 2012–2013 [2]. This is a UK, not US, population. [single-source]
A 2025 clinical-epidemiological analysis from a Romanian university veterinary teaching hospital (Iasi University of Life Sciences) examined 1,485 cats between January 2021 and December 2024 (a retrospective phase, 2021–2022, and a prospective phase, 2023–2024) and found 120 (8.1%) met CKD diagnostic criteria. Of those 120 confirmed cases, IRIS-stage distribution at diagnosis was Stage I 15.83%, Stage II 40.83%, Stage III 35.83%, and Stage IV 7.5%; 89.2% (107/120) were over seven years of age, with the highest concentration in the 10–14-year band [5]. This is the only IRIS-stage-at-diagnosis distribution and the only age-banded diagnosis breakdown located across either this report or the sibling domain dossier's own prior search. [single-source]
A US prospective screening study at the University of Wisconsin-Madison enrolled 129 client-owned cats aged ≥12 years whose owners perceived them as healthy (2022–2024) and found diagnostic testing "revealed a high prevalence of previously unrecognized disease, including chronic kidney disease (49 of 80 [61.3%])" [4]. This is a small (n=80 tested), self-selected "wellness" cohort at a single US teaching hospital, not a general-population estimate. [single-source]
A separate case-control study drawn from 755 US primary-care veterinary hospitals (1,230 cats with a clinical CKD diagnosis and 1,230 age-matched controls) is not a prevalence estimate — its case:control ratio is fixed by design — but it quantifies risk factors: "Risk factors for CKD in cats included thin body condition, prior periodontal disease or cystitis, anesthesia or documented dehydration in the preceding year, being a neutered male (vs spayed female), and living anywhere in the United States other than the northeast." The same study reports that median weight loss during the preceding 6 to 12 months was 10.8% and 2.1% in cats with and without CKD, respectively [3]. [single-source]
Three non-affiliated sources agree, without needing a marker, that CKD is a disease whose diagnosis concentrates in older cats: the ISFM consensus guideline states plainly that "CKD is one of the most commonly diagnosed diseases in older cats" [6]; the Romanian teaching-hospital analysis found 89.2% of confirmed cases in cats over seven years old, peaking at 10–14 years [5]; and the UK primary-care cohort separately identifies CKD as "the most frequent cause of death in cats aged over five years" with a median survival following diagnosis of 388 days (IQR 88–1042 days) [2].
The Wisconsin screening study also quantifies how often CKD goes unnoticed by owners before testing: among cats found to have CKD, "75.6% (34 of 45) of affected cats had no owner-reported change" in urination and "only 1.3% (1 of 78) had reported increased thirst" despite increased urination being statistically associated with the diagnosis [4]. [single-source]
No study located by any PubMed query run this pass (including queries targeting "incidence," "trend," and "longitudinal cohort" terms specifically) measures a change in feline CKD prevalence or incidence over time, in the US or any other country. A commercial industry report — Banfield Pet Hospital's 2012 "State of Pet Health Report" — is described in secondary sources (a veterinary trade-press summary and general web-search results) as reporting an increase in diagnosed kidney disease between 2007 and 2011 in its aggregated caseload, but the primary document itself could not be retrieved this pass: a copy filed with a related FDA public docket returned HTTP 403 on direct fetch, and a JAVMA News article describing the report returned no retrievable content. Per this report's sourcing rule, that reported figure is named here as seen and not used, not treated as a finding.
[1] Marino CL, Lascelles BDX, Vaden SL, Gruen ME, Marks SL. "Prevalence and classification of chronic kidney disease in cats randomly selected from four age groups and in cats recruited for degenerative joint disease studies." J Feline Med Surg. (published 2014; accessed 2026-09-01). PMID 24217707 — https://pubmed.ncbi.nlm.nih.gov/24217707/ [peer-reviewed] [2] O'Neill DG, et al. "Chronic kidney disease in cats attending primary care practice in the UK: a VetCompass study." Vet Rec. (published 2019; accessed 2026-09-01). PMID 31023949 — https://pubmed.ncbi.nlm.nih.gov/31023949/ [peer-reviewed] [3] "Risk factors associated with the development of chronic kidney disease in cats evaluated at primary care veterinary hospitals." J Am Vet Med Assoc. (published 2014; accessed 2026-09-01). PMID 24432964 — https://pubmed.ncbi.nlm.nih.gov/24432964/ [peer-reviewed] [4] "Clinically important abnormalities are common in senior cats perceived to be healthy by owners." J Am Vet Med Assoc. (published 2026, month not given in the PubMed record; accessed 2026-09-01). PMID 42526494 — https://pubmed.ncbi.nlm.nih.gov/42526494/ [peer-reviewed] [5] "Epidemiology of Chronic Kidney Disease (CKD) in Cats: An Analysis of the Factors Involved." Life (Basel). (published 2025-12-03; accessed 2026-09-01). PMID 41465795 — https://pmc.ncbi.nlm.nih.gov/articles/PMC12734309/ [peer-reviewed] [6] Sparkes AH, et al. "ISFM Consensus Guidelines on the Diagnosis and Management of Feline Chronic Kidney Disease." J Feline Med Surg. (published 2016; accessed 2026-09-01). PMID 26936494 — https://pubmed.ncbi.nlm.nih.gov/26936494/ [guideline]
Well established: CKD's status as a common, age-associated diagnosis in cats generally rests on ≥2 independent, non-affiliated sources ([5], [6], and consistent with the age patterns in [1] and [2]) even though the specific prevalence percentage differs sharply by population and none of these sources shares authorship or funding with another.
Thin: Every specific prevalence, incidence, staging, demographic, or risk-factor percentage in §3 rests on exactly one source and carries a [single-source] marker there — [1]'s 50%/68.8% cohort figures, [2]'s 1.2% UK primary-care prevalence and 388-day median survival, [3]'s risk-factor and weight-loss figures, [4]'s 61.3% previously-unrecognized-CKD figure and symptom-underreporting figures, and [5]'s 8.1% teaching-hospital prevalence and IRIS-stage distribution.
Rescoped from class 3: None. This report addresses class 1/2 (registry-fact and published-finding) questions about condition, prevalence, incidence and trend direction; no question about what a person would do was posed for this manifest row, so no rescoping applies.
Out of scope: Per the manifest's scope note, no US federal dataset covers veterinary population, prevalence, or procedure-volume data. AVMA member-survey microdata, the Veterinary Medical Database, and Banfield/Mars aggregated EHR "State of Pet Health" report data are commercial/licensed platforms and were not queried directly. VetCompass itself is a UK (and separately Australian) primary-care database with no US-equivalent connector reachable here, which is why [2] is UK rather than US data.
Not searched vs. not found: A US-specific, general-population, current prevalence or incidence figure is not found — multiple PubMed queries run this pass targeting exactly this question (variants combining "prevalence," "incidence," "United States," and "chronic kidney disease cats") returned only non-US, cohort-selected, small-screening, or case-control-only study designs, none of which substitutes for a population estimate. A trend direction over time (any country) is likewise not found by any PubMed query run this pass using "incidence," "trend," "longitudinal," and "over time" search terms. A total US owned-cat population figure (used only to scale a prevalence estimate, not cited as a prevalence finding itself) was located via web search on AVMA's own pet-ownership statistics page but was not used: that page carries no resolvable identifier (no DOI, filing reference, or other identifier could be found for it), so per this report's identifier requirement it is named here as seen and not cited, rather than used to scale any of the figures above. The Banfield 2012 "State of Pet Health Report" trend figure described in §3 was searched for at the primary-document level — a copy filed with FDA public docket FDA-2011-N-0922-0544 and a JAVMA News article describing the report — and both retrieval attempts failed (HTTP 403 and an empty/unretrievable response, respectively, both 2026-09-01): not retrieved, not used.
[inference] Reading [5]'s finding that 89.2% of confirmed cases occurred in cats over seven years old alongside [1]'s finding that early-stage (I/II) CKD appears at broadly similar prevalence across a wide age range (1–15 years) suggests that a meaningful share of CKD in the wider population may be early-stage disease present well before the age at which most cases are actually diagnosed. Neither source states this directly, and the inference does not account for either study's own selection method — a single teaching-hospital caseload and a DJD-recruited research cohort, respectively — so it should not be read as a population estimate.
| Proposition | Evidence class | Resolvable identifier | Dossier section |
|---|---|---|---|
| CKD prevalence among cats attending UK primary-care practice (n=353,448, 244 clinics, 2012-2013) was estimated at 1.2% (95% CI 1.1-1.3%) | 2 published | PMID 31023949 | 1. Condition & epidemiology |
| Median survival time following CKD diagnosis in a UK primary-care cohort was 388 days (IQR 88-1042 days) and CKD was the most frequent cause of death in cats over five years of age | 2 published | PMID 31023949 | 1. Condition & epidemiology |
| Among 1,485 cats examined at a Romanian university veterinary teaching hospital (2021-2024), 120 (8.1%) met CKD diagnostic criteria, distributed by IRIS stage as 15.83% Stage I, 40.83% Stage II, 35.83% Stage III, and 7.5% Stage IV, with 89.2% (107/120) of cases in cats over seven years old | 2 published | PMID 41465795 | 1. Condition & epidemiology |
| In a prospective US screening cohort of 129 owner-perceived-healthy senior cats (University of Wisconsin-Madison, 2022-2024), previously unrecognized CKD was found in 49 of 80 tested (61.3%), and 75.6% (34/45) of affected cats had no owner-reported change in urination | 2 published | PMID 42526494 | 1. Condition & epidemiology |
| Median weight loss in the 6-12 months preceding CKD diagnosis was 10.8% versus 2.1% in age-matched controls, across a case-control study of 1,230 CKD cases and 1,230 controls drawn from 755 US primary-care veterinary hospitals | 2 published | PMID 24432964 | 1. Condition & epidemiology |