Polycystic Kidney Disease (PKD)
Learn what the condition is, how it may be detected early, how it is treated or managed, and which breeds or species are linked to it.
Condition snapshot
A concise guide to the condition’s pattern, detection, management and urgency.
Breeding advice appliesUse the condition’s screening guidance and veterinary or genetics advice before breeding an affected or at-risk animal.
This snapshot is a general guide, not a diagnosis or treatment plan. New, severe or worsening signs require veterinary assessment.
About the condition
Polycystic kidney disease, usually abbreviated PKD, is an inherited disorder in which multiple fluid-filled cysts develop within the kidneys. It is best known in Persian and Persian-related cats, although it can occur in other lines. The cysts are present from an early age and gradually enlarge, replacing functional kidney tissue in some affected cats.
The disease is inherited as an autosomal dominant trait in recognised feline PKD. This means a cat only needs one copy of the causative variant to be affected and can pass the variant to offspring. The number and size of cysts vary between individuals, so the age at which kidney function declines also varies.
Young affected cats may appear completely healthy. As cysts enlarge and kidney function is lost, signs become similar to chronic kidney disease: increased thirst and urination, weight loss, poor appetite, vomiting, dehydration and reduced activity. High blood pressure and other complications of CKD may also develop.
A positive genetic result does not indicate how severe disease will become or exactly when signs will appear.
There is no treatment that removes all cysts or corrects the genetic defect. The most effective population-level control is responsible breeding that prevents affected cats from producing further affected kittens.
The presence of cysts does not mean a young cat is already in kidney failure. Some affected cats maintain adequate function for years, while others progress earlier.
Because the trait is dominant, an affected breeding cat can transmit the variant even if it has no clinical kidney disease. Cysts can often be detected before kidney values become abnormal, although interpretation depends on the cat’s age and the operator’s experience. For affected pet cats, the focus remains quality of life rather than genetic status.
Screening & Early Detection
Cats from Persian, Exotic, Himalayan and other lines with recognised PKD risk can be screened before breeding. A validated DNA test for the known PKD1 variant can identify genetically affected cats from a blood or cheek-swab sample.
Renal ultrasound is another important tool. Ultrasound is also useful for cats with unknown ancestry or those being investigated for kidney disease.
For a cat known to be affected, monitoring shifts from genetic status to kidney health. Regular body weight, blood pressure, blood chemistry and urinalysis help detect the onset of chronic kidney disease. Increased thirst, larger urine clumps, weight loss, poor appetite or vomiting should be investigated promptly.
A negative test for the recognised mutation is highly useful in validated breeds but does not replace routine health care or exclude unrelated kidney disorders. Early identification is valuable both for breeding decisions and for establishing a baseline so declining kidney function can be recognised promptly.
Diagnosis can be made by genetic testing for the recognised PKD1 variant in breeds where that test is validated. Ultrasound can identify characteristic renal cysts and is particularly useful when genetic status is unknown or when kidney function needs to be assessed. The important distinction is between carrying the inherited disease and developing clinically significant CKD, which is why ongoing monitoring matters after a positive test.
Treatment & Management
There is no treatment that can remove the inherited tendency to form renal cysts. A cat with cysts but normal kidney function may need no specific medication; the priority is regular monitoring so chronic kidney disease is recognised early if it develops.
Once kidney function declines, treatment follows the same principles used for other forms of CKD. A renal diet may be recommended, hydration supported with wet food and additional fluids when needed, and high blood pressure or phosphorus controlled if they become problems. Nausea, poor appetite, potassium abnormalities and anaemia are managed according to the individual cat.
Large cysts are not routinely drained because they often refill and the procedure does not correct the underlying disease. Intervention is considered only in unusual circumstances where a cyst is creating a specific complication.
Breeding management is central to prevention. Cats that test positive for the causative PKD variant should not be used to produce future litters, because a clinically normal-looking parent can still transmit the disorder. Many live comfortably for years before kidney function is significantly impaired, particularly when monitoring identifies complications early.
Management becomes focused on chronic kidney disease if renal function begins to decline.
Breeds or species affected
Birman
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Bombay
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British Longhair
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British Shorthair
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Burmilla
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Cornish Rex
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Devon Rex
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Donskoy
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Exotic Shorthair
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Himalayan
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Minuet
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Minskin
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Persian
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Peterbald
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RagaMuffin
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Ragdoll
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Scottish Fold
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Scottish Straight
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Selkirk Rex
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Siberian
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Snowshoe
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Sphynx
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Bambino
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Dwelf
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Elf Cat
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