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Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Cat bloodwork is a set of clues, not a diagnosis. A complete blood count (CBC) looks at blood cells, while a chemistry panel measures substances such as kidney-associated waste products, enzymes, proteins, glucose, and electrolytes. Your veterinarian interprets both alongside your cat’s symptoms, examination, sample quality, and previous results. A result just outside the printed range may be incidental; a result inside it does not rule out every illness.
What are the main parts of a cat blood test?
Most routine bloodwork includes a CBC and a chemistry panel, though the exact tests vary by laboratory and order. Each panel answers different questions, and neither should be read as a stand-alone diagnosis.
Complete blood count (CBC)
A CBC, also called a hemogram, assesses red blood cells, white blood cells, and platelets. Depending on the laboratory, it may report red-cell count, hemoglobin, hematocrit (HCT or PCV), red-cell indices such as MCV, a white-cell count and differential, and platelet count. A smear review may add information about cell shape, appearance, and platelet clumping.
These red-cell measurements are related but not interchangeable. Hematocrit estimates the portion of blood volume made up of red cells; the red-cell count and hemoglobin provide other measures of red-cell quantity and oxygen-carrying capacity. Cornell’s routine hemogram also includes a white-cell differential, platelet measurements and smear estimates, cell morphology, plasma appearance, and total protein. Its laboratory automatically adds a reticulocyte count to CBCs from anemic cats. Cornell’s hematology overview describes its hemogram components.
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Chemistry panel
A chemistry panel measures substances in the blood, often including urea nitrogen (BUN), creatinine, electrolytes, glucose, proteins, bilirubin, and liver- or muscle-associated enzymes. The name of a panel does not guarantee that two laboratories measure the same set of analytes. Cornell’s small-animal panel, for example, lists urea nitrogen, creatinine, sodium, potassium, chloride, bicarbonate, glucose, albumin, globulin, bilirubin, ALT, AST, alkaline phosphatase, and other analytes. Cornell’s panel guide lists its offerings.
How should I read a flagged result?
Start with the reference interval printed beside the result on your cat’s own report. Reference intervals depend on the laboratory’s instruments, methods, sample type, and reference population. Cornell says its intervals are specific to its laboratory and were developed using at least 50 healthy adult animals; some measurements vary with age, so an adult interval may not fit a young animal. Cornell’s reference-interval explanation discusses how its ranges are established.
A reference interval is not a hard line separating health from illness. Cornell says its intervals include 95% of normal samples. That means a healthy animal can have a result slightly outside the range. And when many tests are run, the chance of at least one out-of-range result rises even if the animal is healthy: Cornell illustrates this with 46% for 12 tests and 66% for 21 tests, calculated using p = 1 − 0.95n. Those figures describe statistical behavior of reference intervals; they do not mean that 46% or 66% of cats have disease.
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How much a result matters depends on its size, whether related results form a pattern, whether the same change persists over time, and whether it fits your cat’s signs and history. Sample quality, hydration, medications, age, and fasting status where relevant can also affect interpretation. A value’s position on the page is a prompt for a clinical question, not a diagnosis or a reason to start treatment on your own.
What can red blood cell results tell you?
A low hematocrit or another abnormal red-cell result raises the question of anemia, but it does not identify the cause. Broadly, anemia can result from blood loss, red-cell destruction, or insufficient red-cell production. A reticulocyte count helps show whether the bone marrow is responding by releasing young red cells. Cornell describes these mechanisms and the role of reticulocytes in its feline anemia overview.
Kidney disease is one possible reason for reduced red-cell production, but it is not the only one. Your veterinarian may consider the reticulocyte result, smear appearance, other CBC findings, symptoms, and additional tests before deciding what the pattern means. Ask whether the anemia appears regenerative (the marrow is responding) or nonregenerative, and whether a smear review or further investigation is appropriate.
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What do white blood cells and platelets mean?
The white-cell count and differential describe different types of immune cells. Changes may accompany infection, inflammation, stress responses, medications, or bone-marrow disorders. A count alone cannot establish which explanation applies; the pattern and clinical context matter.
Platelets help blood clot. In cats, platelets can clump in a sample, which may complicate an automated count. If a report or your veterinarian mentions clumping, ask whether a smear review can clarify whether the measured count represents the sample accurately. Cornell distinguishes automated hemograms from routine hemograms that include smear and morphology review in its hematology guidance.
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How should kidney-related blood results be interpreted?
BUN, creatinine, and SDMA are among the blood measurements used to evaluate kidney function, but no single one gives a complete picture of kidney function or prognosis. Dehydration can raise BUN and creatinine, while low muscle mass can make creatinine look normal despite impaired kidney function. Cornell notes that SDMA is less affected by those factors, but it still needs interpretation alongside the rest of the case.
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Urinalysis adds important information, including urine concentration (specific gravity), pH, and checks for blood cells, bacteria, and other cells. Depending on the case, a urine protein-to-creatinine ratio (UPC) or urine culture may also help. Clinical status and hydration matter when interpreting results. Cornell recommends interpreting at least two blood and urine samples collected within two weeks from a stable, well-hydrated cat when evaluating kidney function. Cornell’s chronic kidney disease guidance explains these factors.
Do not infer chronic kidney disease stage from one creatinine or SDMA result. Cornell says staging should be done when a cat is stable and hydrated; urine protein and blood pressure also inform substaging. Your veterinarian can explain whether repeat testing or additional measurements are needed for your cat.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What do liver enzymes, glucose, proteins, and electrolytes show?
Chemistry results are most useful as patterns rather than one-marker-to-one-disease labels. Enzyme activities and bilirubin may prompt evaluation of liver, biliary, muscle, or other issues, but an elevation does not automatically pinpoint the source. Electrolytes and glucose likewise need to be considered alongside symptoms, medications, sample quality, and the rest of the panel. Your veterinarian can explain which results matter together and whether follow-up testing is warranted.
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Can normal bloodwork rule out disease?
No. Some illnesses may not produce a clear change on a routine CBC or chemistry panel, particularly early on or when the disease is mild or chronic. Cornell notes that routine screening work in feline pancreatitis can be normal or nonspecific. Diagnosis may combine clinical signs, multiple tests, and imaging; feline pancreatic lipase immunoreactivity (fPLI) is described as the most specific available blood test, but it can miss mild or chronic cases. Cornell’s pancreatitis overview explains the diagnostic limits.
Blood tests help adjust the likelihood of different explanations and guide next steps. They do not replace a history, physical examination, or other diagnostics when those are needed.
Quick Recap
What should I ask my veterinarian about the report?
- Which results matter most given my cat’s symptoms and examination, and which might be mild or incidental flags?
- Were the results compared with this laboratory’s feline reference interval and the appropriate sample type?
- Would a smear review, reticulocyte count, urinalysis, urine culture, blood pressure measurement, imaging, or repeat sample help?
- How do these results compare with my cat’s earlier tests?
- Which changes need attention now, and what signs should prompt urgent contact?
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