Pallor is defined as an abnormal lightness of the skin or mucous membranes. In cats, this is most easily observed in the gums, the lining of the eyelids, the nose (if unpigmented), and the paw pads.
In the Chronic Kidney Disease (CKD) cat, pallor is the primary physical indicator of Anemia of Chronic Kidney Disease.
The "EPO" Failure Healthy kidneys produce a hormone called Erythropoietin (EPO). This hormone travels to the bone marrow and acts as a "green light," signaling the marrow to produce new red blood cells. As kidney tissue dies, EPO production drops.
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The Result: The bone marrow stops making new red blood cells. The old cells die off naturally, but no replacements are coming. The blood becomes "thin" and watery.
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The Look: Instead of a healthy, vibrant "bubblegum pink," the gums turn pale pink, grayish, or in severe cases, stark white like porcelain or paper.
The "CRT" Test Owners can assess pallor using the Capillary Refill Time (CRT) test.
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Lift the cat's lip.
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Press your finger firmly against the gum to squeeze the blood out (the spot will turn white).
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Release and count how fast the pink color returns.
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Normal: The pink returns in less than 2 seconds.
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Abnormal: If it takes longer, or if there is barely any pink to return, the cat has poor circulation or severe anemia.
The Connection to Pica Cats with pallor often display a bizarre behavioral symptom called Pica. Due to the lack of iron or red blood cells, the cat develops strange cravings. They may start licking concrete, eating clay cat litter, or chewing on dirt. If a CKD cat starts eating its litter, check its gums immediately.
Disclaimer: This content is for educational purposes only and does not constitute veterinary medical advice. Always consult with your primary care veterinarian or a veterinary internal medicine specialist regarding your cat’s specific condition.