A complete blood count (CBC) measures the main cells in a dog or cat’s blood. It helps a veterinarian assess red blood cells, white blood cells and platelets. The result is one part of the investigation: it must be read alongside the animal’s symptoms, examination, history and any other tests.
What does a CBC measure?
Red blood cells carry oxygen. The report may include the red cell count, haemoglobin and haematocrit (also called packed cell volume or PCV). A low result can support a finding of anaemia, but the CBC alone does not establish its cause.
White blood cells are involved in the body’s response to illness. A total count and a breakdown of cell types help the veterinarian assess patterns that may accompany inflammation or infection. An abnormal white cell count is a clue, not a diagnosis of a particular infection.
Platelets help blood clot. Their number matters, but the report’s comments matter too. Platelets can collect in clumps in a sample, making an automated count difficult to interpret.
The Merck Veterinary Manual’s overview of medical tests explains the roles of these three cell groups and the difference between haematology and clinical chemistry.
How should you read a flagged result?
Start with the reference interval printed by the reporting laboratory. Use the interval for the correct species and test; a human report or another animal’s result is not a suitable comparison.
Next, read the comments beside the numbers. Does the report mention a sample problem, platelet clumping or a recommendation for further assessment? Ask the treating veterinarian what those comments mean for your pet.
Finally, discuss the pattern rather than a single highlighted number. Useful questions at the consultation include:
- Which findings fit the symptoms and examination?
- Could sample quality affect the result?
- Does the veterinarian need a blood smear assessment or another test?
- Is a repeat sample needed, and when should it be collected?
Avoid choosing treatment from a screenshot of the report. Keep the complete report available so the veterinarian can see the units, intervals and comments together.
Is a CBC the same as a kidney or liver blood test?
No. A CBC focuses on blood cells. A chemistry profile measures other substances in blood and can help assess organ function. Your veterinarian may request both, or combine blood testing with urine testing, imaging or a more targeted investigation.
Ask what question each requested test is intended to answer. A normal CBC does not make other investigations unnecessary when the animal’s symptoms still need an explanation.
Why do sample handling and blood smears matter?
A blood-cell count depends on the specimen reaching the laboratory in a suitable condition. Collection, identification and transport should follow the receiving laboratory’s instructions.
An automated count and a blood smear assessment provide different information. A smear allows cells to be examined visually, while an instrument produces measurements and counts. The exact components included in a CBC vary between laboratories. Cornell’s haematology guidance describes these distinctions and how platelet clumps can affect interpretation.
For a submission to eLAB Diagnostics, the clinic should confirm the requested test, specimen requirements and arrangements before collection. See information for veterinarians or contact eLAB on 1800 889 1900. The tests page is a starting point for enquiries; confirm current availability directly.
Frequently asked questions
Does an abnormal CBC mean my pet has a serious disease?
An abnormal value needs interpretation. Its significance depends on the pattern, the animal’s condition and any sample comments. Ask the treating veterinarian how it affects the next step.
Should my dog or cat fast before a CBC?
Follow the collecting clinic’s instructions. Preparation can depend on other tests ordered at the same visit and your pet’s health. Do not withhold food or change prescribed medicine without veterinary advice.
Can I use an old CBC to assess a new illness?
An earlier report can be useful for comparison, but it does not describe the animal’s current condition. Bring previous results to the appointment and let the veterinarian decide whether fresh testing is needed.
Where can I ask about sending a sample in Kochi?
eLAB Diagnostics provides information for referring veterinarians in Kochi. Contact the laboratory before collection to confirm the requested investigation and submission requirements.