How to Read Your Dog’s Blood Test Results

ImmunityQ&AMeongsiljang Veterinary Advisory Board

We’ll walk you through the key items on your dog’s blood test results and what they mean, explained in simple terms for pet owners. You’ll find easy-to-understand interpretations of each component in routine blood tests and serum chemistry panels, along with practical guidance on how to respond if any values fall outside the normal range.

Understanding Your Dog’s Blood Test Report

A Golden Retriever undergoing a blood test at the animal hospital

A canine blood test is a fundamental diagnostic tool that provides a comprehensive overview of your dog’s health by analyzing blood cell counts, organ function markers, and electrolyte balance. The most important step is understanding the specific items listed on the report and their corresponding normal ranges. By familiarizing yourself with what each value signifies before consulting your veterinarian, you can gain a much clearer and more accurate understanding of your pet’s condition. We’ve compiled a complete guide covering the key components of both complete blood counts and serum chemistry panels, along with how to interpret abnormal results.

Two Types of Blood Tests

When your pet undergoes blood tests at the clinic, two types are typically performed together.

Complete Blood Count (CBC): This test evaluates the number and morphology of blood cells, including red blood cells, white blood cells, and platelets. It helps identify conditions such as anemia, infection, inflammation, and bleeding tendencies.

Serum Chemistry Panel: This test assesses organ function—particularly of the liver, kidneys, and pancreas—as well as blood glucose levels and electrolyte balance. Think of it as a check on whether your pet’s organs are functioning properly.

Reviewing both tests together provides a comprehensive, three-dimensional view of your pet’s overall health.

Key Items in a Complete Blood Count

These are common parameters found on routine blood test reports. Let’s explore what it means when each value is higher or lower than normal.

Parameter	What It Assesses	When Elevated	When Low
Red Blood Cells (RBC)	Oxygen-carrying capacity	Dehydration, polycythemia	Anemia
White Blood Cells (WBC)	Immune and inflammatory response	Infection, inflammation, stress	Immunosuppression
Platelets (PLT)	Blood-clotting ability	Inflammation, reactive thrombocytosis	Risk of bleeding
Hematocrit (HCT)	Proportion of red blood cells	Dehydration	Anemia
Hemoglobin (HGB)	Oxygen-binding protein	Dehydration	Anemia

Key Items in a Serum Chemistry Panel

These are the key serum chemistry tests used to assess organ function.

Test	Organ Assessed	Elevated Levels	Low Levels
ALT (Liver Enzyme)	Liver	Hepatitis, liver damage	Rare
BUN (Blood Urea Nitrogen)	Kidneys	Kidney disease, dehydration	Liver disease, hypoproteinemia
CREA (Creatinine)	Kidneys	Kidney failure, dehydration	Decreased muscle mass
GLU (Blood Glucose)	Pancreas	Diabetes, stress	Hypoglycemia
TP (Total Protein)	Systemic	Dehydration, inflammation	Malnutrition
ALB (Albumin)	Liver, Kidneys	Dehydration	Liver disease, renal loss

The reference ranges are listed next to each item on the results sheet. Please check whether your pet’s values fall within these ranges.

A veterinarian reviewing a dog’s blood test results.

When Quick Action Is Needed

If any of the following values fall significantly outside the reference range, consult your veterinarian immediately. • Red blood cells significantly below the reference range → Severe anemia; a blood transfusion may be necessary. • White blood cells extremely high or low → Possible serious infection or bone marrow disorder. • Liver enzymes significantly above the reference range → Possible acute liver damage. • Blood urea nitrogen and creatinine both elevated → Possible kidney failure. • Blood glucose extremely low → Hypoglycemic emergency.

How to Interpret Values in Combination

When reviewing lab results, it’s more important to look at multiple values together rather than focusing on a single item.

Simultaneous decrease in red blood cells and hematocrit: This strongly suggests progressing anemia. The treatment approach will differ depending on whether the cause is bleeding, red blood cell destruction, or insufficient production.

Abnormalities in both liver enzymes and albumin: This signals that the liver is not producing proteins properly, indicating potentially significant decline in liver function.

Simultaneous elevation of blood urea nitrogen and creatinine: This strongly suggests impaired kidney function. A urinalysis is also needed to accurately determine the stage of kidney disease.

Veterinarians evaluate these combinations holistically, so there’s no need to become overly anxious about a single abnormal value.

A veterinarian explaining blood test results to the pet owner.

Pre-Test Preparation and Regular Testing Intervals

To ensure accurate results, there are a few things to prepare before the test.

Fasting: Your dog needs to fast for an appropriate period before the test. After eating, blood sugar and lipid levels can temporarily rise, which may affect the accuracy of the results. The fasting duration can vary depending on your dog's condition and the type of test, so it's safest to follow your veterinarian's instructions.

Inform About Medications: Any medications your dog is currently taking can influence various test results. Be sure to inform your veterinarian about all medications your dog is using before the test.

Regular Check-up Schedule: It's important to monitor health changes through regular blood tests, even for healthy dogs. The appropriate testing interval can vary based on age, health status, and the presence of underlying conditions, so we recommend consulting with your veterinarian to determine the best schedule for your pet. Senior dogs or those with underlying conditions may need more frequent tests.

A puppy with a bandage on its front leg after blood was drawn.

What Pet Owners Must Remember

Blood test results are like a snapshot of your pet’s health on that particular day. It’s difficult to confirm a disease based on a single result. A slightly abnormal value doesn’t necessarily mean a serious illness, and even if the results are within the normal range, sudden changes compared to previous tests may require attention. Instead of trying to interpret the results on your own through internet searches, it’s most accurate and safe to have your veterinarian explain the overall context.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

How much does a blood test for dogs typically cost?

The specific tests depend on the clinic and the items included. Some clinics may only perform a basic blood panel, while others might add hormone or specialized tests. It's best to check with your vet beforehand to understand what's included.

Does my dog feel a lot of pain during blood draws?

Blood is usually drawn from a vein in the front or hind leg, and the procedure is over quickly. Most dogs don’t experience significant pain, but sensitive pups may feel a bit uncomfortable. Having you there to comfort them can help.

Does a normal blood test result mean my pet is completely healthy?

Even if blood test results are normal, it doesn’t rule out all possible conditions. Some diseases are difficult to detect through blood tests alone, so it’s a good idea to combine them with a physical examination and imaging tests for a more comprehensive assessment.

At what age should puppies start getting blood tests?

For healthy dogs, it’s a good idea to get a blood test to establish baseline values before surgery or when they reach adulthood. The frequency of follow-up tests will vary depending on age and health status, so it’s best to consult with your veterinarian to determine the most appropriate testing schedule for your pet.

Can I bring my pet’s previous medical records from another clinic to your hospital?

Yes, previous test results can be used as reference at other veterinary clinics as well. Although reference ranges may vary slightly depending on the testing laboratory, these records are very helpful for veterinarians to compare and assess changes in the values.

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References

[1] Stockham SL, Scott MA. Fundamentals of Veterinary Clinical Pathology, 3rd Edition. Wiley-Blackwell. Chapter 2–6: Hematology & Clinical Chemistry.

[2] Tilley LP, Smith FWK. Blackwell's Five-Minute Veterinary Consult: Canine and Feline, 7th Edition. Wiley-Blackwell.

[3] Silverstein DC, Hopper K. Small Animal Critical Care Medicine, 3rd Edition. Elsevier. Appendix: Reference Ranges for Dogs and Cats.