Definition

Trypsinogen is a substance that is normally produced in the pancreas and released into the small intestine. Trypsinogen is converted to trypsin. Then it starts the process needed to break down proteins into their building blocks (called amino acids).

A test can be done to measure the amount of trypsinogen in your blood.

Alternative Names

Serum trypsin; Trypsin-like immunoreactivity; Serum trypsinogen; Immunoreactive trypsin

How the Test is Performed

A blood sample is taken from a vein. The blood sample is sent to a lab for testing.

How to Prepare for the Test

There are no special preparations. You may be asked to not eat or drink for 8 hours before the test.

How the Test will Feel

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

Why the Test is Performed

This test is done to detect diseases of the pancreas.

The test is also used to screen newborn babies for cystic fibrosis.

Normal Results

Normal value ranges may vary slightly among different laboratories. Talk to your health care provider about the meaning of your specific test results.

What Abnormal Results Mean

Increased levels of trypsinogen may be due to:

• Abnormal production of pancreatic enzymes
• Acute pancreatitis
• Cystic fibrosis
• Pancreatic cancer

Very low levels may be seen in people with chronic pancreatitis.

Risks

There is little risk involved with having your blood taken. Veins and arteries vary in size from one person to another and from one side of the body to the other. Taking blood from some people may be more difficult than from others.

Other risks associated with having blood drawn are slight, but may include:

• Fainting or feeling lightheaded
• Multiple punctures to locate veins
• Hematoma (blood buildup under the skin)
• Excessive bleeding
• Infection (a slight risk any time the skin is broken)

Considerations

Other tests used to detect pancreas diseases may include:

• Serum amylase
• Serum lipase

References

Chernecky CC, Berger BJ. Trypsin- plasma or serum. In: Chernecky CC, Berger BJ, eds. Laboratory Tests and Diagnostic Procedures. 6th ed. St Louis, MO: Elsevier Saunders; 2013:1125-1126.

Forsmark CE. Chronic pancreatitis. In: Feldman M, Friedman LS, Brandt LJ, eds. Sleisenger and Fordtran's Gastrointestinal and Liver Disease. 11th ed. Philadelphia, PA: Elsevier; 2021:chap 59.

Siddiqi HA, Rabinowitz S, Axiotis CA. Laboratory diagnosis of gastrointestinal and pancreatic disorders. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24th ed. Philadelphia, PA: Elsevier; 2022:chap 23.