Dog Lab Results: ALKP, ALT, BUN, RBC and WBC Decoded

ALKP on a dog's lab results means alkaline phosphatase, an enzyme produced by the liver, the bile ducts and growing bone, and it is one of the least specific numbers on the whole panel. Before you read any further, if your dog is vomiting repeatedly, collapsing, jaundiced, refusing food, drinking or urinating far more than usual, straining to urinate, breathing hard, bleeding or passing blood, stop reading and call your veterinarian or an emergency clinic now, because an abnormal lab value alongside those signs needs same-day attention rather than internet research.

If your dog is bright, eating and acting normally and you are simply trying to decode a printout that arrived by email, this page walks through what each abbreviation stands for and what high or low values can point toward. It will not tell you what is wrong with your dog. Only your veterinarian, who has the physical exam findings, the history and the full panel in front of them, can do that.

How to read the report before you read any single value

Most wellness or sick-dog bloodwork comes back as two or three blocks. The chemistry panel looks at organ function and metabolism. The complete blood count (CBC) counts and measures red cells, white cells and platelets. Many reports add electrolytes, a urinalysis, or a thyroid value such as T4.

Next to every result there is a reference interval, usually two numbers in a separate column, and often an H or an L flag when your dog's value sits outside it. That printed interval is the only range that matters for your dog's report. Reference intervals are built by each laboratory for its own analyzer and its own population of dogs, so a value that reads high on an in-clinic machine can sit comfortably inside the range at a reference laboratory. That is why no normal ranges are printed in this article: quoting a number that does not match your lab's column would mislead you, and results vary from dog to dog depending on age, breed, muscle mass, hydration and whether the dog had eaten.

Two more things change how a number should be read. Puppies and adolescents run different values from adults, particularly bone-related ones. And some breeds have well documented differences: sighthounds such as Greyhounds typically carry a higher packed cell volume with lower white cell and platelet counts, Cavalier King Charles Spaniels commonly have an inherited condition producing fewer but larger platelets, and Akitas and some other Japanese breeds can have naturally small red cells.

The chemistry panel, line by line

Abbreviation	What it measures	High can suggest	Low can suggest
ALKP / ALP	Alkaline phosphatase, from liver, bile ducts and bone	Steroid medication, Cushing's disease, reduced bile flow, liver nodules, bone growth in young dogs	Rarely significant on its own
ALT	Alanine aminotransferase, released when liver cells are injured	Liver cell damage from infection, toxins, medication or chronic liver disease	Rarely significant
AST	Enzyme found in liver and in muscle	Liver or muscle injury, including after seizures or heavy exertion	Rarely significant
GGT	Bile duct enzyme	Obstructed bile flow, steroid effect, some liver disease	Rarely significant
TBIL	Total bilirubin, pigment from broken down red cells	Jaundice from liver disease, bile obstruction or red cell destruction	Rarely significant
BUN	Blood urea nitrogen, a protein waste product cleared by the kidneys	Dehydration, reduced kidney function, a high protein meal, bleeding into the gut	Liver disease, low protein diet, overhydration
CREA	Creatinine, a muscle waste product cleared by the kidneys	Dehydration or reduced kidney filtration	Low muscle mass, very lean or young dogs
SDMA	A newer marker of kidney filtration	Reduced filtration, sometimes before creatinine moves	Rarely significant
PHOS	Phosphorus	Advanced kidney disease, young growing dogs	Dietary or hormonal causes
GLU	Blood glucose	Diabetes, stress, a recent meal	Severe illness, sepsis, insulin excess, some toy breed puppies
ALB	Albumin, the main protein made by the liver	Dehydration	Protein loss through gut, kidney or skin, liver disease, inflammation
GLOB	Globulin, antibodies and other carrier proteins	Chronic inflammation, infection, immune or tick-borne disease	Immune deficiency, blood loss
TP	Total protein, albumin plus globulin	Dehydration, inflammation	Protein loss, bleeding
CA	Calcium	Certain cancers, kidney disease, parathyroid problems	Low albumin, nursing bitches, parathyroid problems
NA / K / CL	Sodium, potassium, chloride	Dehydration, kidney or urinary obstruction	Vomiting, diarrhea, Addison's disease

A few of these deserve a sentence more. ALKP and ALP are the same enzyme written two ways, so if one lab reports ALKP and another reports ALP, you are looking at the same thing. It rises for many reasons that have nothing to do with liver failure: research suggests that in older dogs, benign changes in liver tissue are a common source of a mild, persistent elevation, and steroids and phenobarbital reliably push it up.

ALT is the more liver-specific of the two enzymes, and it reflects leakage from damaged liver cells rather than how well the liver is working. BUN and creatinine are usually read together and alongside a urine specific gravity, because a dehydrated dog with concentrated urine tells a very different story from a dog with dilute urine and the same BUN.

The complete blood count, line by line

Abbreviation	What it measures	High can suggest	Low can suggest
RBC	Red blood cell count	Dehydration, certain breeds, chronic low oxygen	Anemia from blood loss, destruction or reduced production
HGB	Hemoglobin, the oxygen carrying protein	Dehydration, some breeds	Anemia
HCT / PCV	Hematocrit, the percentage of blood made up of red cells	Dehydration, sighthound breeds, splenic contraction	Anemia, blood loss, marrow or kidney disease
MCV	Average red cell size	Regenerating anemia, some breeds	Iron deficiency, chronic blood loss, liver shunt
MCH	Average hemoglobin content per red cell	Usually read with MCV and MCHC	Iron deficiency
MCHC	Hemoglobin concentration within red cells	Often a sample artifact from hemolysis or fatty serum	Iron deficiency or active regeneration
RDW	How variable red cell size is	New cells entering circulation, mixed cell populations	Rarely significant
RETIC	Reticulocytes, immature red cells	The marrow is responding to anemia	Anemia that is not regenerating
WBC	Total white blood cell count	Infection, inflammation, stress, steroids, some leukemias	Overwhelming infection, viral disease, marrow suppression
NEU	Neutrophils, the main bacteria-fighting cell	Bacterial infection, inflammation, stress or steroid effect	Severe infection consuming them, marrow disease
LYM	Lymphocytes, immune memory cells	Chronic stimulation, some leukemias, Addison's disease	Stress, steroids, protein loss
MONO	Monocytes, clean-up cells	Chronic or deep-seated inflammation, steroid effect	Rarely significant
EOS	Eosinophils	Parasites, fleas, allergic or airway disease	Stress and steroids
BASO	Basophils	Parasites, some allergic disease	Rarely significant
PLT	Platelets, the clotting cells	Inflammation, iron deficiency, after spleen removal	Clumping in the sample, immune destruction, tick-borne disease, active bleeding
MPV	Mean platelet volume, average platelet size	New platelets being released, some breeds	Reduced marrow production
PCT	Plateletcrit, the fraction of blood volume made of platelets	Very high platelet numbers	Low platelet numbers or large clumps

The red cell indices are easiest to understand as a set. RBC counts the cells, HGB measures the oxygen-carrying protein inside them, and HCT describes how much of the blood volume they occupy. MCV, MCH and MCHC then describe what the average cell looks like: how big it is, how much hemoglobin it holds and how concentrated that hemoglobin is. Small, pale cells point one direction, large immature cells another.

Platelet results are the ones most often distorted by the sample itself. Platelets clump as blood clots in the tube, and a clumped sample can report a falsely low PLT with a normal MPV and PCT in a dog that is clotting perfectly well. If your report flags a low platelet count, ask whether a blood smear was reviewed, because a technician looking down a microscope can usually tell clumping from genuine loss.

Why one flagged number is rarely the whole story

A single flagged value on a dog's lab report is a question, not a diagnosis, and only your veterinarian can interpret it against your dog's exam, history, medications and the rest of the panel.

Plenty of ordinary things move these numbers. A meal within a few hours raises glucose and can nudge BUN. A stressful car ride can lift glucose and white cells through an adrenaline surge. A fatty or hemolyzed sample skews MCHC and several chemistry values. Prescribed medication matters enormously: steroids alone can raise ALKP, glucose and neutrophils while dropping lymphocytes and eosinophils, which is a pattern a vet recognizes instantly and an owner reading a printout does not.

Trend beats snapshot. One mildly high ALKP in an otherwise well dog is information. The same value climbing steadily across three panels over a year is a different conversation. This is why vets so often recommend a recheck in a few weeks rather than an immediate work-up, and why keeping copies of every panel is genuinely useful.

Questions worth bringing to the recheck

• Which of these flagged values do you consider clinically meaningful, and which are likely incidental?
• Could any of my dog's current medications or supplements explain this pattern?
• Was a blood smear reviewed, and was the sample quality good?
• Do we need a urinalysis alongside the kidney values to interpret them properly?
• Should we repeat this panel, and if so, when, and should the dog be fasted?
• What would make you want to see my dog sooner than the planned recheck?

Write the answers on the printout itself. Owners who bring an annotated copy to the next visit tend to get a far more useful conversation out of it.

Key Takeaways

• ALKP and ALP are the same liver, bile duct and bone enzyme, and it rises for many benign reasons including steroid medication and normal growth in young dogs.
• ALT is the more liver-specific enzyme, while BUN and creatinine reflect kidney filtration and hydration and are best read with a urinalysis.
• RBC, HGB and HCT describe red cell numbers and oxygen capacity; MCV, MCH and MCHC describe the size and hemoglobin content of the average cell.
• NEU, LYM, MONO, EOS and BASO are the white cell subtypes, and the pattern between them says more than any one count.
• PLT, MPV and PCT describe platelet number, size and total volume, and a low PLT is frequently clumping in the tube rather than true loss.
• Reference intervals belong to the laboratory that ran the sample, so always use the range printed beside your dog's value.
• Flags are prompts for discussion, not verdicts.

Your veterinarian owns the diagnosis and the treatment plan. They are the one who can decide whether a flagged value needs a recheck, imaging, a urine sample or nothing at all, and whether anything you give your dog at home belongs in the picture. Bring the printout, ask your questions, and let the exam and the numbers be read together.

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