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All About Cat Blood Tests

Blood tests may be recommended to help diagnose your cat's symptoms or as part of their wellness exam. Here, we explain some common blood tests for cats and what they tell us about their health.

Cat Bloodwork

Regular veterinary care is crucial for maintaining the health and well-being of your feline companion. As part of a comprehensive examination, your veterinarian may recommend various blood tests to gain valuable insights into your cat's internal health.

Cat Blood Tests & Results Explained

Below, we explore common cat blood tests, including CBC, BUN and Creatinine, ALT and Bilirubin, Glucose, FeLV, FIV, T4, and Electrolytes. We'll discuss what these tests entail and what they reveal about your cat's health.

Complete Blood Count (CBC)

The Complete Blood Count (CBC) is a fundamental blood test that provides a comprehensive overview of your cat's blood components. It includes measurements of red and white blood cells, platelets, and other important parameters. The CBC helps veterinarians assess:

  • Red Blood Cell Count (RBC): An abnormal RBC count may indicate anemia or other blood disorders.
  • White Blood Cell Count (WBC): Abnormal WBC levels can suggest infection, inflammation, or immune system disorders.
  • Platelet Count: Platelets are crucial for blood clotting, and abnormalities may point to bleeding disorders or certain diseases.

CBC helps your veterinarian to identify signs of anemia, infections, immune disorders, or underlying blood disorders that your cat may be suffering from.

BUN & Creatinine

Blood Urea Nitrogen (BUN) and Creatinine tests evaluate kidney function in cats. Abnormal levels of BUN and creatinine may indicate kidney disease or dysfunction. These tests are essential for diagnosing and monitoring kidney health.

BUN & Creatinine tests for cats evaluate your kitty's kidney function and allow your vet to detect signs of kidney disease or dysfunction.

ALT & Bilirubin

Alanine Aminotransferase (ALT) and Bilirubin tests provide insights into liver function. Elevated ALT levels may indicate liver disease, while abnormal Bilirubin levels may suggest issues with bile metabolism or liver function.

ALT & Bilirubin tests assess your cat's liver function and are helpful in detecting liver diseases or abnormalities that might otherwise be missed until symptoms become more severe.


The Glucose test measures the blood sugar levels in cats. High glucose levels can indicate diabetes mellitus, while low levels may suggest hypoglycemia. Regular monitoring of glucose levels is vital for managing and treating diabetes in cats.

Glucose tests provide your vet with insights into your kitty's blood sugar levels and help your vet to diagnose and manage diabetes in cats.

Feline Leukemia Virus (FeLV)

The FeLV test detects the presence of the Feline Leukemia Virus in cats. FeLV is a viral infection that can have serious implications for a cat's health, including immune suppression and the development of certain cancers. Testing for FeLV is crucial, especially for cats at risk due to outdoor exposure or living in multi-cat households.

FeLV blood tests detect the presence of Feline Leukemia Virus, aiding in the prevention and management of this common viral infection in cats.

Feline Immunodeficiency Virus (FIV)

FIV blood tests for cats are essential in detecting the presence of the Feline Immunodeficiency Virus, aiding in the early diagnosis and management of this viral infection. Regular testing helps protect the health of our feline friends and ensures appropriate care.

FIV testing allows vets to look for signs of Feline Immunodeficiency Virus which is a serious condition that can compromise your kitty's immune system and make them more susceptible to infection and disease. 

T4 (Thyroxine)

Thyroxine (T4) is a thyroid hormone that regulates metabolism. Testing T4 levels helps diagnose and monitor thyroid disorders in cats, such as hyperthyroidism or hypothyroidism.

T4 blood tests evaluate thyroid function in cats and help veterinarians to detect signs of hyperthyroidism or hypothyroidism.


Electrolyte tests evaluate the balance of essential minerals, including sodium, potassium, and calcium, in the blood. Electrolyte imbalances can occur due to various health conditions and can impact various bodily functions. Monitoring electrolyte levels is important for maintaining overall health and detecting potential issues.

Electrolytes blood tests for cats a useful for assessing mineral balance, identifying electrolyte imbalances and potential health issues.

Why Cat Blood Tests Are Important

Regular blood testing, in combination with thorough physical examinations, is a key element of proactive healthcare that helps ensure the well-being of your feline friend.

These tests can help your veterinarian detect the earliest signs of diseases or health conditions, allowing for prompt intervention and better treatment outcomes. They provide valuable insights into your feline friend's organ function, metabolic health, and overall well-being, helping your vet to monitor and maintain the optimal health of your beloved kitty.

Note: The advice provided in this post is intended for informational purposes and does not constitute medical advice regarding pets. For an accurate diagnosis of your pet's condition, please make an appointment with your vet.

Our Santa Cruz County vets have vast experience diagnosing and treating illnesses in cats. Contact Aptos-Creekside Pet Hospital to book an examination for your feline family member.

New Patients Welcome

Aptos-Creekside Pet Hospital is accepting new patients! Our experienced vets are passionate about the health of Santa Cruz County companion animals. Get in touch today to book your pet's first appointment.

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