Amylase - blood

A blood sample is taken from a vein.

No special preparation is needed. However, you should avoid alcohol before the test. The health care provider may ask you to stop taking drugs that may affect the test. DO NOT stop taking any medicines without first talking to your provider.

Drugs that can increase amylase measurements include:

• Asparaginase
• Aspirin
• Birth control pills
• Cholinergic medications
• Ethacrynic acid
• Methyldopa
• Opiates (codeine, meperidine, and morphine)
• Thiazide diuretics

You may feel slight pain or a sting when the needle is inserted to draw blood. Afterward, there may be some throbbing.

This test is most often used to diagnose or monitor acute pancreatitis. It may also detect some digestive tract problems.

The test may also be done for the following conditions:

• Chronic pancreatitis
• Pancreatic pseudocyst

The normal range is 23 to 85 units per liter (U/L). Some laboratories give a range of 40 to 140 U/L.

Note: Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.

The examples above show the common measurements for results for these tests. Some laboratories use different measurements or may test different specimens.

Increased blood amylase levels may occur due to:

• Acute pancreatitis
• Cancer of the pancreas, ovaries, or lungs
• Cholecystitis
• Gallbladder attack caused by disease
• Gastroenteritis (severe)
• Infection of the salivary glands (such as mumps) or a blockage
• Intestinal blockage
• Macroamylasemia
• Pancreatic or bile duct blockage
• Perforated ulcer
• Tubal pregnancy (may have burst open)

Decreased amylase levels may occur due to:

• Cancer of the pancreas
• Damage to the pancreas
• Kidney disease
• Toxemia of pregnancy

Slight risks from having blood drawn may include:

• Excessive bleeding
• Fainting or feeling light-headed
• Hematoma (blood accumulating under the skin)
• Infection (a slight risk any time the skin is broken)