Amylase in cats and dogs
Amylase is a digestive enzyme that breaks down starch. The pancreas has the most of it, but the intestine contains some too. It is still found on many biochemistry panels, yet its value for diagnosing pancreatitis is limited: in dogs it also rises with kidney or gut disease, and in cats it rarely rises even with pancreatitis.
What it shows
Amylase is stored in the enzyme granules of the pancreas, which has higher concentrations than other tissues; the duodenum and ileum contain it as well, and dogs have no salivary amylase. When the pancreas is inflamed, more amylase reaches the blood. But the blood level also depends on the kidneys: in dogs with kidney disease eClinPath describes a build-up of large amylase complexes (macroamylase), which can push amylase up to 2–3 times the reference values with no pancreatic disease at all.
For this reason Merck calls the clinical usefulness of serum amylase limited in dogs and cats, and notes that clinical data suggest a specificity for pancreatitis in dogs of only about 50% for both amylase and routine lipase. IDEXX explains the problem the same way: non-pancreatic sources of the enzyme influence the result.
Higher than reference — what it may be a sign of
- Pancreatitis in dogs: according to eClinPath, a rise needs to be at least double the reference to be considered significant and may reach 7–10 times. Amylase peaks 12–48 hours after an episode and returns within 8–14 days; its rise and fall tend to parallel lipase.
- Kidney disease: reduced filtration can raise amylase up to 2–3 times the reference values without pancreatic disease. In an animal with high kidney values, pancreatitis is considered when amylase is above that.
- Intestinal disease or obstruction: moderate rises are possible.
Lower than reference
A value below the range is not what vets use to judge the pancreas. To check whether the pancreas produces enough digestive enzymes (exocrine pancreatic insufficiency), Merck describes a different test — serum trypsin-like immunoreactivity (TLI). A falsely low amylase can come from the sample itself: very lipemic (milky) serum can inhibit enzyme activity, and citrate or fluoride tubes inhibit the reaction, which is why labs use serum or heparin or EDTA plasma.
Look at together with
- Pancreatic lipase (Spec cPL in dogs, Spec fPL in cats) — the pancreas-specific test vets rely on when pancreatitis is suspected.
- Lipase — usually on the same panel; in acute pancreatitis the two rise and fall together.
- Creatinine, urea and SDMA — if they are high, a mildly raised amylase may come from the kidneys.
- Triglycerides — very milky serum can distort the enzyme measurement.
Units and conversion
Amylase is an enzyme, so labs report its activity in units per litre: U/L on English forms, Ед/л or МЕ/л on Russian ones. These are the same unit, so there is nothing to convert. Reference ranges, however, differ between analysers, so a trend is best followed in one lab.
Reference range
The reference range is on your lab’s form. Vets usually describe a rise by how many times it exceeds the upper limit: in a dog with reduced kidney function, up to 2–3 times can come from the kidneys alone, while eClinPath regards at least double the reference as the point where a rise starts to matter for pancreatitis. An amylase within the range does not rule out pancreatitis, especially in cats.
Cats and dogs
In cats amylase tells little about the pancreas: eClinPath notes that increased amylase is rare in cats with pancreatitis, and Merck states that amylase is not a useful indicator of pancreatitis in cats. When pancreatitis is suspected in a cat, vets turn to feline pancreatic lipase (fPL).
In dogs amylase can rise with pancreatitis, but kidney and intestinal disease raise it too, so a high value is read next to kidney markers. Merck notes that amylase in dogs is also increased in chronic renal dysfunction. To confirm pancreatitis, vets may add canine pancreatic lipase (cPL) and, when needed, imaging.
Add a lab form — Pet Tracker Space recognises the lines, keeps the form’s units and draws each indicator over time with your lab’s reference band.
Sources
- eClinPath (Cornell University College of Veterinary Medicine) — Amylase
- Whitbread TJ. Clinical Biochemistry. Merck Veterinary Manual
- Steiner JM. Pancreatitis in Dogs and Cats. Merck Veterinary Manual
- Steiner JM. Exocrine Pancreatic Insufficiency in Dogs and Cats. Merck Veterinary Manual
- IDEXX — Catalyst Pancreatic Lipase Test (white paper)
This page explains what a lab value means. It is not a diagnosis and not a substitute for your veterinarian — only they can interpret results for your pet.