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Digestive Enzyme Analysis – Diagnosis and Significance
Digestive enzyme analysis measures the concentration and activity of digestive enzymes in stool, blood, or breath. It helps detect disorders of the pancreas and gastrointestinal tract at an early stage.
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Digestive enzyme analysis measures the concentration and activity of digestive enzymes in stool, blood, or breath. It helps detect disorders of the pancreas and gastrointestinal tract at an early stage.
What Is Digestive Enzyme Analysis?
Digestive enzyme analysis is a diagnostic procedure that evaluates the quantity and activity of digestive enzymes in the human body. Digestive enzymes are biologically active protein molecules that break down food components such as fats, carbohydrates, and proteins into their basic building blocks so the body can absorb them. Impaired enzyme production or activity can lead to significant digestive problems and nutritional deficiencies.
Which Enzymes Are Tested?
Depending on the clinical question, different digestive enzymes may be analysed. The most important include:
- Elastase-1: A pancreas-specific enzyme measured in stool that reflects exocrine pancreatic function.
- Lipase: A fat-digesting enzyme produced by the pancreas, measured in blood serum; elevated levels indicate pancreatic inflammation.
- Amylase: A carbohydrate-digesting enzyme found in saliva and the pancreas, measured in blood or urine.
- Chymotrypsin: A protein-digesting enzyme that can be detected in stool samples.
- Lactase: An enzyme in the small intestine that breaks down lactose (milk sugar); a deficiency leads to lactose intolerance.
When Is the Analysis Performed?
Digestive enzyme analysis is indicated when symptoms suggest impaired digestion. Common indications include:
- Chronic diarrhoea, fatty stools (steatorrhoea), or bloating
- Unexplained weight loss despite adequate food intake
- Suspected exocrine pancreatic insufficiency (insufficient enzyme production by the pancreas)
- Chronic pancreatitis or a history of pancreatic surgery
- Suspected coeliac disease, Crohn's disease, or other chronic inflammatory bowel conditions
- Evaluation of lactose intolerance or other food intolerances
How Is the Analysis Performed?
Stool Testing
The most common method involves measuring pancreatic elastase-1 in a stool sample using an immunological test (ELISA). Values below 200 µg/g of stool suggest exocrine pancreatic insufficiency.
Blood Testing
Lipase and amylase are measured in blood serum. Markedly elevated levels are characteristic of acute pancreatitis, while persistently low values may indicate chronic insufficiency.
Breath Testing
The hydrogen breath test (H2 breath test) is widely used to diagnose lactose intolerance. The patient ingests a defined amount of lactose, and exhaled air is analysed for elevated hydrogen concentrations produced by bacterial fermentation of undigested lactose in the colon.
What Do the Results Mean?
The results of digestive enzyme analysis provide insight into the function of the pancreas and small intestine. Low fecal elastase-1 levels confirm exocrine pancreatic insufficiency. Elevated blood lipase and amylase indicate acute pancreatic inflammation. A positive lactose breath test points to lactase deficiency. Results must always be interpreted in the overall clinical context and in conjunction with other investigations.
Treatment for Abnormal Findings
Treatment depends on the underlying cause of impaired enzyme activity:
- Enzyme replacement therapy: In exocrine pancreatic insufficiency, oral pancreatic enzyme preparations (e.g., pancreatin) are taken with meals to compensate for the deficiency.
- Dietary modification: A low-lactose or lactose-free diet is recommended for lactose intolerance.
- Treatment of the underlying condition: In pancreatitis, Crohn's disease, or coeliac disease, therapy is directed at the primary condition causing enzyme dysfunction.
References
- Löhr J.M. et al. - United European Gastroenterology evidence-based guidelines for the diagnosis and therapy of chronic pancreatitis. United European Gastroenterology Journal, 2017.
- Dominguez-Munoz J.E. - Diagnosis of chronic pancreatitis: Functional testing. Best Practice and Research Clinical Gastroenterology, 2010.
- Lacy B.E. et al. - ACG Clinical Guideline: Management of Irritable Bowel Syndrome. American Journal of Gastroenterology, 2021.
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