A complete blood count (CBC) measures your pet's red blood cells, white blood cells and platelets. It's one of the most useful tests we have for spotting anemia, infection, inflammation and some blood disorders.

We often run a CBC as part of a wellness exam, before anesthesia and whenever a pet is feeling unwell. Comparing results over time also helps us notice changes early, sometimes before your pet shows any signs.

What a CBC Can Reveal About Your Pet's Health

Each part of a CBC tells us something different. Looking at the full picture, along with your pet's exam and history, helps your vet understand what may be going on inside. A CBC is often paired with a chemistry panel and urinalysis for a more complete view of your pet's health.

  • Red blood cells: low numbers can point to anemia, blood loss or problems with the bone marrow
  • White blood cells: changes may suggest infection, inflammation, stress or some cancers
  • Platelets: these help blood clot, so low counts can explain bruising or bleeding
  • Cell appearance: the size and shape of cells can offer clues, and blood parasites are sometimes seen
  • Hydration: results can show if your pet may be dehydrated

What to Expect When Your Pet Has Blood Drawn

Drawing blood is quick and well tolerated by most dogs and cats. A team member gently holds your pet while a small sample is taken, usually from a leg or neck vein. Some pets feel a brief pinch, and treats and calm handling help keep the visit low stress.

Your vet may ask you to fast your pet beforehand if other blood tests are being run at the same time, so ask when you book. Afterward, a little bruising at the site can happen, especially in pets with thin skin. Once results are ready, we'll explain what they mean and whether any follow-up testing or treatment is recommended.

Questions about Complete Blood Count (CBC)?

Call us or book an appointment online, and our team will help you decide on the next step for your pet.

Complete Blood Count (CBC): Frequently Asked Questions

Does my pet need to fast before a CBC?
A CBC on its own usually doesn't require fasting. If your vet is running other tests at the same visit, such as a chemistry panel, fasting may be recommended because a recent meal can affect some results. Our team will let you know what to do.
How often should my pet have a CBC?
Many vets recommend yearly bloodwork for adult pets and more frequent testing for seniors or pets with ongoing health conditions. Your vet will suggest a schedule based on your pet's age, health and any medications they take.
Why does my pet need bloodwork before anesthesia?
Pre-anesthetic bloodwork helps uncover hidden problems such as anemia, infection or clotting issues that could affect anesthesia or healing. The results help your vet plan the safest approach for your pet's procedure.
What happens if my pet's CBC results are abnormal?
An abnormal result doesn't always mean something serious. Your vet will look at it alongside your pet's exam and history, and may recommend repeating the test, running additional tests or starting treatment, depending on what the results show.

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