Understanding Your Pet's CBC Report: What the Numbers Mean

A CBC (complete blood count) counts the red cells, white cells and platelets in a small blood sample. It can help show anaemia (too few red cells), infection, inflammation or a low platelet count, and your registered veterinarian reads it together with your pet's signs and history.

What a CBC measures

Blood carries three main kinds of cells. The Complete Blood Count (CBC) counts all of them. It needs about 2 mL of blood in an EDTA tube, which stops the blood from clotting.

• Red blood cells (RBCs) carry oxygen around the body. Your report shows the RBC count, haemoglobin (Hb) and PCV (packed cell volume). Hb is the protein that holds oxygen. PCV is the share of the blood made up of red cells.
• White blood cells (WBCs) defend the body against germs. Your report shows the total count and a differential count, which splits the white cells into types such as neutrophils, lymphocytes, monocytes and eosinophils.
• Platelets help the blood to clot after an injury.

When vets ask for a CBC

A CBC is one of the most common blood tests for dogs and cats. Vets often ask for it when a pet has:

• fever, tiredness or weakness
• pale gums
• vomiting or diarrhoea that does not settle
• tick exposure, or signs that fit tick fever
• a planned surgery, or a regular check-up in an older pet

A CBC does not usually need fasting. If other tests, such as blood sugar, are done at the same visit, follow your vet's advice about food. Try to keep your pet calm, because stress can change the white cell count. Routine tests are normally reported the same day or within 24 hours. A CBC may also be repeated later, to see how your pet's values are changing.

What the main numbers may mean

A number outside the printed range is a clue, not a diagnosis. These are common patterns:

• Low Hb, PCV or RBC: may indicate anaemia (too few red cells). Causes include blood loss, red cells being destroyed, as in tick fever, or poor production of red cells during a long illness.
• High PCV: often points to dehydration, because the blood is more concentrated.
• High white cell count: may indicate infection or inflammation (swelling and irritation in the body). Fear or excitement can also raise it, especially in cats.
• Low white cell count: may be seen with some severe infections, some viral illnesses and bone marrow problems. The bone marrow is the soft centre of bones, where blood cells are made.
• High eosinophils: may be linked to allergy or to parasites such as worms.
• Low platelets: may be linked to tick-borne infections, immune problems or bleeding. A very low count can cause nosebleeds, bruises or tiny red spots on the gums or skin.
• High platelets: can be seen with inflammation and after blood loss. Your vet looks at the whole picture.

In cats, platelets sometimes clump together, which makes the count look lower than it really is. A look at the blood smear under the microscope can help clear this up.

Why "normal" is not a pass or fail mark

The reference range printed beside each value is only a guide.

• Dogs and cats have different ranges, and ranges can differ between labs and machines. Always use the range printed on your own report.
• Age and breed matter. Puppies and kittens have different values from adults, and some breeds, such as Greyhounds, normally have a higher PCV.
• The pattern matters more than one number. For example, low Hb with low platelets and fever in a dog with ticks may point towards tick fever.
• Old reports help. Keep them, so your vet can see how your pet's values change over time.

Tests often added to a CBC

A CBC cannot name the exact cause of a problem, so your vet may add other tests:

• The Blood Protozoa (Blood Parasite Smear) test checks stained blood under the microscope for blood parasites, such as those that cause tick fever.
• The Reticulocyte Count counts young red cells. It shows whether the bone marrow is making new red cells in response to anaemia.
• Liver, kidney and blood sugar tests show how the organs are working.

Some health packages already include a CBC. The Basic Health Panel, for example, pairs a CBC with liver and kidney tests.

When to talk to your vet

Show every report to your vet, even if only one value is outside the range. Do not start any medicine or supplement on your own because of a report.

See a vet urgently if your pet has very pale gums, collapses, breathes fast, bleeds, vomits again and again, or will not eat or drink.

Pashupatinath Vet Lab provides free sample collection anywhere in Bhopal. Call or WhatsApp +91 88175 01118 to book. From other towns, samples can be sent to the lab by courier, bus parcel or through your local veterinarian. You can browse all lab tests for Dog and Cat on this website.