Serum Amylase
Amylase digests starch and is produced by both the pancreas and the salivary glands. Traditionally used to diagnose pancreatitis, it has been largely replaced by lipase because it is less specific — mumps, salivary gland disease, kidney failure, and even a ruptured ectopic pregnancy can raise amylase. It rises within 6–12 hours of pancreatic injury and normalizes in 3–5 days, a shorter window than lipase.
Reference Ranges
Male
30 – 110
U/L
Female
30 – 110
U/L
Child
30 – 110
U/L
Ages 1–12
Reference ranges may vary by laboratory. Always compare with the range printed on your lab report.
What Low Levels Mean
Low amylase is uncommon and rarely meaningful. It may be seen in chronic pancreatitis with pancreatic insufficiency, cystic fibrosis, or liver disease. Low amylase alone does not warrant investigation.
What High Levels Mean
Amylase above 3× upper limit of normal in a patient with abdominal pain suggests acute pancreatitis. Other causes of elevation include mumps and other salivary gland disease, kidney failure, intestinal obstruction, perforated peptic ulcer, ectopic pregnancy, and macroamylasemia (a harmless lab finding where amylase binds immunoglobulins).
Frequently Asked Questions
Why is my amylase high but lipase normal?
This pattern usually means the source is non-pancreatic — salivary gland inflammation (mumps, parotitis), a salivary gland tumor, macroamylasemia, or kidney disease with impaired clearance. True acute pancreatitis almost always elevates both enzymes.
What is macroamylasemia?
A benign condition where amylase binds to an immunoglobulin forming a large complex that cannot be filtered by the kidneys. Amylase stays elevated in blood even though there is no pancreatic disease. It can be confirmed by measuring the amylase-to-creatinine clearance ratio, which is very low in macroamylasemia.
Should I still get amylase tested?
If lipase is available, amylase rarely adds value for pancreatitis. Some labs still bundle them; that is fine but not necessary. Amylase remains useful for diagnosing mumps parotitis when there is no lipase rise, and in patients with unusually delayed presentation where both enzyme time courses help.
This information is for educational purposes only and should not replace professional medical advice. Always consult your doctor for interpretation of your test results.
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