Glossary
The terms on your pet's test results, explained in plain language. 110 terms, grouped by type of test.
Blood count
- Anemia
- A shortage of red cells or hemoglobin. Your pet may seem tired, with pale gums.
- Complete blood count (CBC)(CBC, hemogram)
- The test that counts the cells in the blood: red cells, white cells and platelets. It is the starting point of almost every check-up.
- Eosinophils
- White cells tied to allergies and parasites. They often rise with parasites or allergic reactions.
- Hematocrit (HCT)(HCT, PCV)
- The share of blood made up of red cells. Low points to anemia, high often to dehydration.
- Hemoglobin (HGB)(HGB, Hb)
- The protein in red cells that carries oxygen. It moves in step with hematocrit and red cell count.
- Leukocytosis
- White cells above the normal range. Often a sign of infection, inflammation or even just the stress of the visit.
- Leukopenia
- White cells below the normal range. Can point to a viral infection or a problem with the bone marrow.
- Lymphocytes
- White cells of the 'targeted' immune response. They vary with viral infections, stress and immune stimulation.
- MCHC
- The average hemoglobin concentration in the red cells. With MCV it helps frame an anemia.
- MCV(mean corpuscular volume)
- The average size of the red cells: whether they are small or large. It helps classify the type of anemia.
- Monocytes
- White cells that 'clean up' tissue and microbes. They often rise in chronic inflammation.
- Neutrophils
- The most common white cells, the first line against bacterial infections. They rise with infection, inflammation or stress.
- Platelets (PLT)(PLT, thrombocytes)
- The cells that stop bleeding by helping the blood clot. Very low counts raise the risk of bleeding.
- Red blood cells (RBC)(RBC, erythrocytes)
- The cells that carry oxygen. Too few means anemia, too many is usually dehydration.
- Reticulocytes
- Young red blood cells. They show whether the bone marrow is responding to anemia by making new ones.
- Thrombocytopenia
- Platelets below the normal range. When marked it raises the bleeding risk and should be checked by the vet.
- White blood cells (WBC)(WBC, leukocytes)
- The cells of the immune system. They shift when there is an infection, inflammation or stress.
Biochemistry
- Albumin
- The main protein in the blood, made by the liver. Low can point to problems with the liver, kidneys or gut.
- ALP(ALKP, alkaline phosphatase)
- An enzyme linked to the liver, bile ducts and bones. In puppies and kittens it is normally high because of growth.
- ALT(GPT, ALT (GPT))
- A liver enzyme. When it is high it can mean the liver cells are stressed or damaged.
- Amylase
- An enzyme from the pancreas. Read it with lipase to check for possible pancreatitis.
- AST(GOT)
- An enzyme found in the liver and muscles. Read it together with ALT to tell whether the issue is liver or muscle.
- Bile acids
- A test of liver function, often measured fasting and after a meal. High when the liver is not working well.
- Bilirubin
- A pigment made by the liver. When it is high, jaundice can appear (a yellow tint to the gums and eyes).
- Blood glucose(glucose)
- The sugar in the blood. High can mean diabetes or stress (common in cats), low should be looked at right away.
- Cholesterol
- A fat in the blood. In dogs and cats it depends a lot on the meal and on the thyroid, liver and metabolism.
- CK(creatine kinase, CPK)
- An enzyme from muscle and heart. High after hard exercise, trauma, injections or muscle damage.
- Creatinine
- A value that measures kidney function. When it rises it can mean the kidneys are filtering less well.
- Fructosamine
- The average blood sugar over the last 2 to 3 weeks. In diabetes it tells true high sugar from stress.
- GGT
- An enzyme of the bile ducts, useful together with ALP to assess the liver and gallbladder.
- Globulins
- Proteins tied to immune defenses and inflammation. They often rise with chronic infections.
- Lipase
- An enzyme from the pancreas that digests fats. High can point to inflammation of the pancreas.
- SDMA
- An early marker of kidney function, more sensitive than creatinine: it rises sooner when the kidneys start to struggle.
- Specific pancreatic lipase(cPL, fPL, spec cPL, spec fPL)
- A more targeted test for pancreatitis in dogs (cPL) and cats (fPL) than classic amylase and lipase.
- Total protein
- The sum of albumin and globulins in the blood. It helps assess hydration, liver, kidneys and inflammation.
- Triglycerides
- Fats in the blood. Often high after a meal, but they can also be linked to the pancreas, thyroid or metabolism.
- Urea(BUN, blood urea nitrogen)
- A waste product cleared by the kidneys. It rises with kidney problems, but also with dehydration or a protein-rich meal.
Electrolytes and thyroid
- Calcium(Ca)
- A mineral for bones, muscles and nerves. Changes can be linked to the kidneys, parathyroids or, rarely, tumors.
- Chloride(Cl)
- A blood salt that follows sodium and acid-base balance. It shifts with vomiting, diarrhea or dehydration.
- Magnesium(Mg)
- A mineral for muscles and heart. Rarely measured, but it can shift in serious illness or intensive care.
- Phosphorus(phosphate, P)
- A mineral tied to the kidneys and bones. It often rises when kidney function drops.
- Potassium(K)
- A salt important for the heart and muscles. Very high or very low values need to be handled quickly.
- Sodium(Na)
- A salt in the blood tied to fluid balance. It shifts with vomiting, diarrhea or dehydration.
- Total T4(T4, thyroxine)
- The thyroid hormone. High in older cats (hyperthyroidism), low in dogs (hypothyroidism).
Endocrine and metabolism
- ACTH(adrenocorticotropic hormone, corticotropin)
- The hormone that tells the adrenal glands to make cortisol. It is used in dedicated tests to explore adrenal disease in dogs and cats.
- Blood gas analysis(blood gas, ABG, blood pH)
- A blood test measuring oxygen, carbon dioxide and acidity. It helps show how well breathing and the internal balance are working in dogs and cats.
- Cortisol(stress hormone)
- The stress hormone made by the adrenal glands. Values that are too high or too low may point to adrenal disease in dogs and cats.
- Dexamethasone(suppression test, corticosteroid)
- A corticosteroid also used in a test to assess the adrenal glands. It is not a blood value but part of a screening exam, mainly in dogs.
- Insulin
- The hormone that helps move sugar from the blood into the cells. It is central to diabetes in dogs and cats.
- Ketones(ketone bodies, ketonuria)
- Substances made when the body burns fat instead of sugar. Their presence can signal poorly controlled diabetes in dogs and cats.
- Lactate(lactic acid)
- A substance that builds up when tissues get too little oxygen. High values suggest the body is under serious stress, in dogs and cats.
- TSH(thyroid-stimulating hormone, thyrotropin)
- The hormone that tells the thyroid what to do. It is read alongside T4 to better judge an underactive thyroid, especially in dogs.
Urine and feces
- Crystalluria
- Crystals in the urine. Sometimes they precede stones, sometimes they are a minor finding tied to diet or sample handling.
- Fecal exam(stool test, fecal test)
- Testing the stool to look for intestinal parasites, blood or digestive problems.
- Hematuria
- Blood in the urine. It can come from cystitis, stones, trauma or clotting problems: always worth looking into.
- Proteinuria
- Protein in the urine. It can be an early sign that the kidneys are struggling.
- Specific gravity(USG, urine specific gravity)
- How concentrated the urine is. Very dilute urine can mean the kidneys are not concentrating well.
- Urine protein/creatinine ratio(UPC, UP/C)
- Measures how much protein is lost in the urine. It quantifies proteinuria and tracks kidney health over time.
- Urine sediment
- The solid part of the urine seen under the microscope: cells, crystals, bacteria. Useful for cystitis and stones.
Infectious tests
- FeLV
- The feline leukemia virus. It weakens a cat's defenses: a positive result and its management should be discussed with your vet.
- FIV
- The feline immunodeficiency virus, a kind of 'cat AIDS'. It is managed, not cured, and needs monitoring.
- Giardia(giardiasis)
- An intestinal parasite that causes diarrhea, common in puppies and kittens. Found in the stool and treated with targeted drugs.
- Heartworm(heartworm disease, dirofilariasis)
- A parasite spread by mosquitoes that affects a dog's heart and lungs. Better to prevent it than to treat it.
- Leishmania
- A disease spread by sandflies, mostly in dogs. The test measures the antibodies in the blood.
- Parvovirus(parvo, canine parvovirus)
- A highly contagious virus in puppies: it causes vomiting and diarrhea, often with blood. It is an emergency, see the vet right away.
Parasites
- Anaplasma(anaplasmosis)
- A tick-borne microbe that affects blood cells; in dogs it can cause fever, joint pain and low platelets, and is less common in cats.
- Coccidia(coccidiosis, Cystoisospora)
- Microscopic gut parasites that can cause diarrhea, mainly in puppies and kittens; found with a fecal test.
- Ehrlichia(ehrlichiosis)
- A tick-borne microbe that infects blood cells; in dogs it can cause fever, low platelets and tiredness, and is rarer in cats.
- Fleas(Ctenocephalides)
- Tiny insects that live in the coat and feed on blood, causing itching and sometimes allergy; in dogs and cats they can pass on tapeworm if swallowed.
- Hookworms(Ancylostoma)
- Intestinal worms that hook onto the gut wall and feed on blood, which can cause anemia; most dangerous in puppies and kittens.
- Roundworms(Toxocara, ascarids)
- Round intestinal worms very common in puppies and kittens; sometimes seen in stool or vomit and checked with a fecal test.
- Tapeworm(cestodes, Dipylidium)
- A flat intestinal worm whose rice-like segments show up near the anus or in stool; in dogs and cats it often comes from swallowed fleas.
- Ticks(Ixodes, Rhipicephalus)
- Parasites that attach to the skin to feed on blood and can transmit diseases like ehrlichiosis and Lyme; common in dogs and cats that go outdoors.
Common conditions
- Addison's disease(Addison, hypoadrenocorticism)
- A shortage of adrenal gland hormones causing weakness, vomiting and sudden crashes; more typical in dogs, with signs that come and go.
- Chronic kidney disease(CKD, chronic renal failure)
- A slow, progressive loss of kidney function, very common in older cats; often shows up as more drinking and urination and weight loss.
- Cushing's syndrome(Cushing, hyperadrenocorticism)
- Too much cortisol in the body causing heavy drinking and urination, a pot belly and thin coat; typical of older dogs, rare in cats.
- Diabetes mellitus(diabetes)
- A disease where the body cannot manage blood sugar well; typical signs are lots of drinking and urination and hunger with weight loss, in both dogs and cats.
- FLUTD(feline lower urinary tract disease)
- A group of lower urinary tract problems in cats; the pet urinates often, with straining or blood, and sometimes cannot pass urine at all (an emergency).
- Obesity(overweight)
- Excess body fat that strains joints, heart and metabolism; very common and preventable with diet and exercise, in both dogs and cats.
- Osteoarthritis(OA, arthritis, degenerative joint disease)
- Chronic wear of the joints causing pain and stiffness; older pets move less and struggle to jump or climb, both dogs and cats.
- Otitis(ear infection, otitis externa)
- Inflammation of the ear causing itching, head shaking, bad smell or discharge; very common in dogs, often linked to allergies or moisture.
- Pancreatitis
- Inflammation of the pancreas that can cause vomiting, belly pain and loss of appetite; it may follow a very fatty meal, in both dogs and cats.
Heart and breathing
- Arrhythmia(irregular heartbeat)
- A heartbeat that is too fast, too slow or irregular: it may cause no trouble or point to a heart issue worth checking with an electrocardiogram.
- Cardiomyopathy(heart muscle disease, HCM, DCM)
- A disease of the heart muscle that changes its shape or strength: the hypertrophic form (HCM) is typical in cats, the dilated form (DCM) more in dogs.
- Cough
- A forced burst of air to clear the airways: it can come from the bronchi, throat or heart, and if it lasts or comes with breathing trouble it should be checked.
- Dyspnea(difficulty breathing, labored breathing)
- Hard or labored breathing: the animal struggles to get air and should be seen quickly, since in cats especially it is often a serious sign.
- Heart murmur
- An extra sound the vet hears with the stethoscope when blood flows turbulently through the heart: sometimes harmless, sometimes a sign of a valve problem, common in older dogs.
- Pleural effusion(fluid in the chest)
- A buildup of fluid around the lungs, in the chest space, that squeezes them and hampers breathing: in cats it is a common cause of sudden breathing difficulty.
- Pulmonary edema(fluid in the lungs)
- A buildup of fluid in the lungs that makes breathing hard: often linked to a heart problem, it is an emergency that needs a vet right away.
Skin and eyes
- Alopecia(hair loss)
- Loss of fur with thinning or bald patches. In dogs and cats it can be due to scratching, parasites, allergies or hormonal imbalances.
- Conjunctivitis(pink eye, red eye)
- Inflammation of the membrane lining the eye, with redness and discharge. It is common in cats, often linked to infections, and also seen in dogs.
- Corneal ulcer(ulcer of the cornea)
- A sore on the clear surface of the eye, often painful, with a half-closed watery eye. In dogs and cats it should be seen by the vet promptly.
- Dermatitis(skin inflammation)
- Inflammation of the skin that can cause redness, itching and crusts. In dogs and cats it has many causes, from allergies to parasites to infections.
- Dermatophytosis(ringworm, skin fungal infection)
- A fungal infection of skin and fur, with bald patches and crusts. It is common in cats and can spread to other animals and to people.
- Itching(pruritus)
- The sensation that makes a pet scratch, lick or nibble itself. It is a very common sign of allergies, parasites or skin infections in dogs and cats.
Imaging
- Biopsy(histology, histopathology)
- Removal of a small piece of tissue examined under the microscope; it gives fuller information than cytology about the nature of a lump or an organ.
- Blood smear(blood film, peripheral smear)
- A drop of blood spread on a glass slide and viewed under the microscope; it lets the vet see the shape of cells and complete the numbers of the blood count.
- CT scan(CT, computed tomography, CAT scan)
- A series of X-rays the computer builds into detailed cross-section images; useful for bones, chest and masses, and usually needs sedation in dogs and cats.
- Cytology(fine needle aspirate, FNA)
- Microscope study of a few cells, often taken with a thin needle from a lump or fluid; a quick first clue about the nature of a mass in dogs and cats.
- Echocardiography(echo, cardiac ultrasound, heart scan)
- An ultrasound focused on the heart that shows its chambers, valves and beat; helps assess murmurs and heart disease, common in cats and some dog breeds.
- Magnetic resonance imaging (MRI)(MRI, MR)
- A scan using magnets and radio waves, without X-rays, that shows soft tissues like brain and spinal cord very well; needs anesthesia so the pet stays still.
- Radiograph (X-ray)(X-ray, radiography)
- An image made with X-rays that mainly shows bones, chest and abdomen; used to spot fractures, swallowed objects or the shape of organs in dogs and cats.
- Ultrasound(echo, sonography, ultrasonography)
- A test using sound waves to look at soft internal organs like liver, kidneys and bladder in real time; it uses no radiation and is painless for dogs and cats.
Common medications
- Antibiotic(antibiotics)
- A drug that fights bacterial infections; it should be given for the full course even if the pet seems better, to keep bacteria from becoming resistant.
- Antiemetic(anti-nausea drug)
- A drug that stops vomiting and nausea, often used with gastroenteritis or during other treatments, so the dog or cat starts eating and drinking again.
- Corticosteroids(cortisone, steroids)
- Strong drugs against inflammation and allergies; used for controlled periods and never stopped abruptly, in both dogs and cats, to avoid rebound effects.
- Fluid therapy(IV fluids, drip)
- Giving fluids into a vein or under the skin to rehydrate and support a dehydrated or ill pet; widely used in cats with kidney problems.
- Gastroprotectant(stomach protectant, antacid)
- A drug that protects the stomach by lowering acidity, used with vomiting, ulcers or alongside other medicines that can irritate it, in dogs and cats.
- NSAIDs(non-steroidal anti-inflammatory, anti-inflammatory)
- Anti-inflammatory drugs that ease pain and swelling, used for arthritis or after surgery; in cats they must be used very carefully and never combined with steroids.
- Painkiller(analgesic)
- A drug that relieves pain, used after surgery or in chronic illness; for cats and dogs it must always be chosen by the vet, never taken from human medicines.