Your vet hands you a page full of abbreviations — CBC, ALT, BUN, WBC — and numbers with little arrows next to them. Blood work is one of the most powerful tools in veterinary medicine, but the results can feel like a foreign language. This guide explains what your pet's blood test results actually mean, in plain English.
A quick note: This guide is for general understanding only. Always interpret results with your veterinarian — a single value out of range rarely tells the whole story, and context is everything.
Why vets run blood work
Blood tests let your vet see inside your pet without surgery. They're used to:
- •Establish a healthy baseline for a young pet
- •Screen senior pets for early disease
- •Check organ function before anesthesia or surgery
- •Diagnose why a pet is sick
- •Monitor a chronic condition or medication
The real power comes from trends over time — a value drifting across several tests often matters more than one snapshot.
The two main tests
Complete Blood Count (CBC)
The CBC looks at the cells in the blood:
- •RBC / HCT / HGB — red blood cells and how well oxygen is carried. Low can mean anemia; high can mean dehydration.
- •WBC — white blood cells, the immune system. High can signal infection or inflammation; low can mean other issues.
- •PLT (platelets) — help blood clot.
Chemistry Panel
The chemistry panel checks organ function and metabolism:
- •ALT, AST, ALP — liver enzymes
- •BUN, CREA (creatinine) — kidney function
- •GLU (glucose) — blood sugar (relevant to diabetes)
- •Electrolytes (sodium, potassium) — balance and hydration
- •Total protein, albumin — nutrition, hydration, and organ clues
What the arrows and ranges mean
Each value is compared to a reference range — the normal window for a healthy pet. An H (high) or L (low), or an arrow, flags anything outside it. But:
- •A value slightly out of range isn't automatically a problem.
- •Ranges differ between labs, species, and even breeds.
- •Some values shift with age, hydration, stress, or a recent meal.
This is why interpretation belongs to your vet, who reads the whole picture together with your pet's exam and history.
Why tracking results over time matters
A single blood panel is a snapshot. The real insight is the trend. A kidney value creeping up over three years, or a liver enzyme that's slowly climbing, can flag a problem long before your pet shows symptoms — but only if you (or your vet) can compare against past results.
That's hard to do when panels are scattered across clinics and paper printouts. Keeping them in one place lets you and your vet see the trajectory, not just today's number.
Keep every lab result in one place
Blood work is only as useful as your ability to find and compare it. Instead of losing lab sheets in a drawer:
- •Snap each result so it's digitized and dated.
- •Keep them on one timeline per pet, alongside vaccines and visits.
- •Share the history with a new vet or specialist in one tap.
PetLover keeps your pet's lab results, vet visits, and weight in one organized health passport — so when a number changes, you and your vet can see exactly how it compares to before.
Frequently asked questions
How often should my pet have blood work?
A healthy adult often gets baseline work at annual visits, while senior pets (typically 7+) benefit from more frequent screening. Your vet will advise based on age and health.
Should I worry about one value being out of range?
Not necessarily. Many slightly abnormal values are harmless or explained by hydration, a recent meal, or stress. Your vet interprets it in context — ask them what it means for your pet.
Can I keep my own copies of lab results?
Absolutely, and you should. Ask for a copy of every result and keep them together so trends are easy to see over time.
The bottom line
Your pet's blood test results aren't as intimidating as they look: the CBC checks blood cells, the chemistry panel checks organ function, and reference ranges flag what to look at. The real value is watching trends over time — so keep every result organized and let your vet connect the dots.
