Pyruvate Kinase Deficiency
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
Pyruvate kinase deficiency is an inherited disorder of red blood cells. Pyruvate kinase is an enzyme needed for normal energy production within the cell. Mature red blood cells have no mitochondria and depend heavily on this pathway, so insufficient enzyme activity shortens their lifespan and causes chronic haemolytic anaemia.
Affected cats can have episodes of pallor, lethargy, weakness, reduced appetite or poor exercise tolerance. Because red blood cells are being destroyed, jaundice may occur. The spleen can enlarge as it removes damaged cells and participates in increased red-cell turnover. Some cats compensate surprisingly well between episodes and may not appear continuously anaemic.
The disease is recognised in several breeds and lines, including Abyssinian, Somali and related cats, and inherited forms are autosomal recessive. Carriers have one copy of the causative variant and remain clinically normal. Affected cats inherit two copies.
Other causes of haemolytic anaemia, including immune-mediated disease, blood parasites, toxins and oxidative injury, must still be considered in a sick cat.
There is no medication that restores pyruvate kinase activity in circulating red cells. The severity is variable; some cats remain stable for long periods, while others develop repeated or severe anaemic crises. Iron supplementation should not be given automatically because the problem is red-cell enzyme deficiency, not dietary iron deficiency, and unnecessary iron can be harmful.
The episodic nature can be misleading because a cat may look healthy between anaemic periods. The underlying red-cell defect is still present even when the packed cell volume temporarily improves. Monitoring therefore focuses on both clinical episodes and the cat’s baseline ability to compensate for ongoing red-cell destruction.
Splenic enlargement or intermittent episodes can be useful clues. Early recognition of a falling packed cell volume allows supportive care to begin before profound weakness or collapse.
Screening & Early Detection
Cats from breeds with a recognised pyruvate kinase deficiency variant can be DNA tested before breeding. Because carriers are healthy, normal appearance and a normal blood count do not identify carrier status. Genetic results should be known before mating two cats from at-risk lines.
In a symptomatic cat, a complete blood count assesses the degree of anaemia and whether the bone marrow is responding by releasing new red cells. Blood smears and biochemical tests can provide evidence of haemolysis, while bilirubin may rise if red-cell destruction is substantial.
A positive breed-appropriate DNA test can confirm inherited pyruvate kinase deficiency, but other causes of anaemia should still be excluded when the clinical picture is unusual.
Routine blood-count monitoring may be recommended for affected cats even when they seem well. Breeding screening remains the most effective way to prevent new affected kittens.
Diagnosis combines a complete blood count and evidence of regenerative haemolysis with a validated DNA test where the relevant breed-associated variant is known.
Treatment & Management
Management depends on the severity of anaemia. Mildly affected cats may need monitoring only, while severe haemolytic episodes can require hospitalisation, oxygen support and blood transfusion. Transfusions replace red cells temporarily but do not correct the underlying enzyme deficiency.
The spleen plays a role in removing abnormal red cells, and splenectomy has been used in selected severely affected cats to reduce haemolysis. It is not appropriate for every case and does not cure the genetic defect. The risks and likely benefit should be discussed with an experienced veterinarian.
Nutrition should remain complete and balanced. Iron is not prescribed unless true iron deficiency has been demonstrated. Concurrent infections, stress or illness can worsen anaemia and are treated promptly.
Affected cats benefit from periodic blood counts and monitoring for jaundice, weakness and exercise intolerance. Prognosis is variable but some cats live for years with careful management. The disease is best controlled at population level through DNA testing and responsible mating. Carrier cats do not need medical treatment, but two carriers should not be bred together.
Cats that have undergone splenectomy still need monitoring because abnormal red-cell production remains and other complications of chronic haemolysis can occur.
Breeds or species affected
Abyssinian
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Australian Mist
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Bengal
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Egyptian Mau
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LaPerm
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Maine Coon
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Norwegian Forest Cat
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Ocicat
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Savannah
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Siberian
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Singapura
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Somali
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Tonkinese
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Toyger
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Cheetoh
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Serengeti
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