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Cat Blood Test Results Explained – What Should I Look For?

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Image Credit: SingingMedia, Shutterstock
Last Updated on November 16, 2023 by Rachael Gerkensmeyer

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Dr. Lorna Whittemore


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Sometimes, cats show signs of an illness or disease, but confirmed diagnosis isn’t possible without blood tests. Blood tests have a wide range of uses in veterinary medicine. They can help verify the good health or illness of a cat, infectious disease, and even genetic disorders. Whatever the reason for their use, blood tests are a staple in veterinary medicine. As a cat owner, you should understand how blood tests may play a role in your cat’s health care as time goes on. It can be helpful to be prepared for when and why tests are recommended and what the vets are looking for in the results.


When a Blood Test Might Be Ordered

Blood tests are not necessary every time a cat gets ill, is injured, or is overdue for a checkup. However, your veterinarian may recommend them in many situations as they provide a lot of useful information in determining health and illness. Common times that your veterinarian might order a blood test for your kitty include:

  • The Initial Vet Visit: If you are visiting a veterinarian for the first time and don’t have medical records for your cat, the vet may want to order a blood test to gain a clear understanding of your kitty’s health and ensure that no abnormalities are present.
  • Upon New Life Stages or Wellness exam: Your veterinarian might want to check your cat’s bloodwork when they reach a new life stage. This is especially true when a cat reaches the geriatric stage of its life, when problems like kidney disease are more likely to start developing. Regular blood tests can help to pick up reduction in organ function earlier on.
  • When examination of patient history indicates: If after examination and listening to your concerns it becomes apparent a blood test is necessary to look into the problem in more detail your vet will discuss what tests are suggested.
  • Before Surgery: Most veterinarians recommend blood tests for their patients before surgery takes place, even if the surgery is minor. This helps them determine whether any underlying conditions could affect the outcome of surgery or put the cat in harm’s way while the surgery takes place.
  • Travel: If you are traveling or emigrating with your pet the country you are visiting may have a legal requirement for certain blood samples to be taken.
  • Genetics: Some illnesses are inherited and the genes can be looked for in a blood sample at special laboratories.

There may be other reasons that a veterinarian would want to order a blood test for your cat. So, don’t be surprised if a blood test is recommended when you take your kitty in for a checkup. It does not always mean that there is something wrong with your cat; it could just mean that a few things need to be examined and verified. Your veterinarian will explain the exact reason for the blood test before any blood is drawn.

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Types of Blood Tests That May Be Ordered

There are a few different types of blood tests that your veterinarian might recommend for your cat at one time or another. Each blood test is designed to uncover something specific that can help tell your vet about the health of your cat.

blood samplles in test tubes
Image Credit: fernandozhiminaicela, Pixabay
Here are the most common types of blood tests that you should be aware of:
  • A Complete Blood Count: This blood test helps a vet analyze the white and red blood cells, such as number and type present. This can give information on the immune system, infections, inflammation, hemoglobin levels, anemia, hydration status and blood clotting ability.
  • Feline Leukemia and Immunodeficiency Virus: This type of test is usually recommended for cats with unknown backgrounds (like those adopted from shelters) and those who spend most of their time outside, fight or are unvaccinated or not fixed. This test detects both feline leukemia and feline immunodeficiency virus, infectious diseases that could lead to serious illness and even death.
  • Hormone Testing: This is a blood test that helps veterinarians detect for example thyroid problems. An overactive thyroid gland is a common condition in older cats.
  • Blood Serum Chemistry: This is a group of blood tests that helps measure electrolytes, proteins and enzyme levels, and enables the veterinarian to analyze organ function. This is a set of tests that can be tailored to requirements but is often run as a panel of most commonly requested markers. They can give a vet many details about the overall health of a cat. Older cats that display signs of illness or disease and take chronic medications are the most likely candidates for this type of testing. But any age of cat may need a chemistry profile running from time to time.

You can expect your veterinarian to tell you exactly what type of blood test they are ordering and what they expect to learn from it. Not all illnesses will show up on blood tests initially and some-times they need to be repeated.

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Common Test Names to Familiarize Yourself With

Many different things are measured when a blood test is conducted, so it is important to understand what some of these markers are and what they might mean. Your veterinarian can explain whether any markers are elevated or decreased, and help you understand what information this gives about your cat’s health.

Hand holding blood samples in test tubes
Image Credit: Belova59, Pixabay
Here are some names you may here mentioned:
  • Albumin: A protein that is made in the liver and may increase in dehydration and decrease in diseases of the liver, kidney and in some blood loss problems.
  • Creatinine: Produced by muscle metabolism it helps to evaluate kidney function. It can also be affected by a recent meal and muscle mass.
  • Alkaline Phosphatase-ALKP: In cats this is primarily used to detect liver and biliary problems. Increases can also be seen in hyperthyroidism, with epilepsy medications and in young animals due to rapid bone growth.
  • Gamma Glutamyl Transferase-GGT: A more sensitive indicator of liver and biliary tract disease than ALP in cats (except in fatty liver disease). It is useful to determine reduced bile flow-cholestasis.
  • Alanine Aminotransferase-ALT: Can help detect liver injury, muscle disease and some bleeding disorders and may be increased in hyperthyroidism.
  • Globulin: These are proteins that are made primarily in the liver but also by the lymphoid system. Elevated levels can indicate inflammation, certain infectious diseases, liver problems and sometimes tumors.
  • Blood Urea Nitrogen: Urea is made by the liver after the digestion of proteins in the intestines and then excreted from the body via the kidneys. It is used primarily to help look at kidney functionality along with creatinine.
  • Glucose: Measures blood glucose levels, which can help a vet determine whether a cat has diabetes or low blood sugar levels.
  • Calcium: Changes in calcium levels can help a veterinarian detect serious problems.
  • Total Bilirubin: Can help diagnose liver and biliary problems and haemolytic anemia.

The results of your cat’s blood test may include any of these markers and even others that are not listed here. The test should indicate the normal levels for each of the markers and the levels detected in your cat. If levels are lower or higher than normal, there could be a problem for you and your veterinarian to address.

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A Quick Recap

A blood test is an important tool that can help detect illnesses and diseases that your cat is suffering from. They can also help your vet monitor illness and that your cat is tolerating medication well. Your veterinarian will always tell you what kind of blood test they want to run and why, so you can prepare yourself before getting the results.  Blood results are complicated and need interpreting carefully, with the whole picture of your cat and presentation taken into mind. Veterinary medicine can be both an art and a science in this respect.  As such it is not likely that a veterinarian will just send you a copy of the results.  They will want to discuss them with you.

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Featured Image Credit: SingingMedia, Shutterstock

About the Author

Rachael Gerkensmeyer
Rachael Gerkensmeyer
Rachael has been a freelance writer since 2000, in which time she has had an opportunity to research and write about many different topics while working to master the art of fusing high-quality content with effective content marketing strategies. She is an artist at heart and loves to read, paint, and make jewelry in her spare time. As a vegan, Rachael is obsessed with helping animals in need both in her community and anywhere in the world where she feels she can make a difference. Animals also happen to be her favorite topic to write about! She lives off the grid in Hawaii with her husband, her garden, and her rescue animals including 5 dogs, a cat, a goat, and dozens of chickens.

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