Alpha-Amylase (serum or urine)

Alpha-amylase is a digestive enzyme that breaks down starch, produced mainly by the pancreas and salivary glands. This test measures amylase in blood or urine and is most often used for suspected pancreatic inflammation, usually alongside lipase.

Who the test is for

• people with upper abdominal pain spreading to the back, with nausea and vomiting, when acute pancreatitis is suspected;
• people with painful, swollen salivary glands, for example in mumps or a salivary duct stone;
• people recovering from pancreatitis and those with bile duct disease, for monitoring;
• people having general check-ups, alongside lipase and liver tests;
• people with high amylase without symptoms, when a doctor investigates the cause.

What amylase is and what it indicates

Pancreatic amylase enters the intestine and salivary amylase enters saliva, beginning starch digestion. A small amount continually enters blood and is excreted by the kidneys into urine. When the pancreas or salivary glands are inflamed or damaged, more amylase enters blood, raising both blood and urine levels.

Because amylase does not originate only in the pancreas, a high result does not always mean pancreatic disease. For acute pancreatitis, preference is now given to lipase, which is more pancreas-specific and stays elevated longer.

Severe abdominal pain: when it is urgent

Acute pancreatitis is treated in hospital. With severe, persistent upper abdominal pain, particularly accompanied by vomiting, fever, yellowing of the skin or eyes or marked weakness, seek emergency medical care immediately without waiting for laboratory results.

Preparation and sample

Blood amylase is measured in venous blood. Fasting is not essential, but if glucose or lipids are tested that day, come in the morning after fasting. Urine amylase uses a urine sample, usually a single sample, though a doctor sometimes requests urine collected over 24 hours. Bring urine in as soon as possible, preferably within 2 hours. Tell your doctor which medicines you take because some, such as opioid painkillers, can raise amylase.

How results are interpreted

Amylase is expressed in U/L, with the reference interval depending on the method and printed on the report. A doctor interprets results alongside symptoms, examination and other tests.

Amylase and acute pancreatitis

In acute pancreatitis, blood amylase rises within hours of pain onset and usually returns to the reference interval in three to five days. Diagnosis requires two of three criteria: typical abdominal pain, amylase or lipase at least three times the upper reference limit, and pancreatic inflammation on imaging. The degree of amylase elevation does not show inflammation severity, and amylase may be normal in pancreatitis with very high triglycerides.

Other causes of high amylase

• salivary gland diseases: mumps, inflammation or a salivary duct stone;
• reduced kidney function, because amylase is excreted more slowly (more about creatinine);
• other abdominal emergencies: perforated ulcer, intestinal obstruction or impaired bowel blood supply, ectopic pregnancy;
• bile duct diseases, diabetic ketoacidosis, excessive alcohol consumption and certain medicines;
• macroamylasaemia.

Macroamylasaemia

In macroamylasaemia, amylase binds to antibodies in blood, forming larger complexes the kidneys cannot excrete. Blood amylase is persistently high while urine amylase is normal or low, with normal lipase and no symptoms. It is harmless and needs no treatment, but doctors examining you should know about it.

Urine amylase

Urine amylase reaches higher values and stays elevated longer than blood amylase. It may therefore help several days after symptoms begin and, alongside blood amylase, helps identify macroamylasaemia. Blood tests are more reliable for diagnosing pancreatitis itself.

How to arrange testing

You can have blood taken without an appointment or referral at one of our branches across Croatia (listed on the Contact page). Every branch accepts urine samples. Prices for all tests and panels are available in the service price list. Amylase and lipase can be measured from the same blood sample.

Frequently asked questions

What does high amylase without abdominal pain mean?

Mildly high amylase without symptoms is most often not pancreatitis. Causes may include reduced kidney function, salivary gland disease, medicines or macroamylasaemia. A doctor usually repeats testing and measures lipase and, if needed, urine amylase.

Is amylase or lipase better?

For suspected acute pancreatitis, lipase is more reliable: it mainly originates in the pancreas and remains elevated longer. Amylase is often tested alongside it and is more useful in salivary gland disease.

What does low amylase mean?

Low amylase rarely has particular significance. It may occur in long-term pancreatic damage, such as chronic pancreatitis or cystic fibrosis, but a doctor uses other tests to assess pancreatic digestive function.