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[Fecal chymotrypsin concentration in childhood. Normal values, specificity, sensitivity]
Insights
Fecal chymotrypsin testing is a reliable, noninvasive method for assessing exocrine pancreatic function. This photometric assay shows high sensitivity and specificity, with normal values established for individuals over one year old.
Area of Science:
- Biochemistry
- Gastroenterology
- Clinical Diagnostics
Context:
- Exocrine pancreatic insufficiency (EPI) diagnosis requires reliable functional tests.
- Noninvasive methods are preferred for patient convenience and reduced burden.
- Fecal chymotrypsin is a key enzyme marker for pancreatic exocrine function.
Purpose:
- To evaluate the diagnostic performance of fecal chymotrypsin determination as a noninvasive screening test for exocrine pancreatic function.
- To establish normal value ranges for fecal chymotrypsin in different age groups.
- To assess the reproducibility and practicality of the photometric assay.
Summary:
- A photometric assay for fecal chymotrypsin demonstrated 87.5% specificity and 80% sensitivity in evaluating exocrine pancreatic function.
- The lowest normal value for fecal chymotrypsin is 72 micrograms/g stool beyond the first year of life.
- The assay is reproducible, and spot stool samples eliminate the need for 72-hour collections.
Impact:
- Provides a validated, noninvasive screening tool for exocrine pancreatic dysfunction.
- Simplifies diagnostic protocols for pancreatic insufficiency.
- Facilitates earlier detection and management of pancreatic disorders.
Abstract:
The determination of fecal chymotrypsin is a suitable noninvasive screening test for the evaluation of exocrine pancreatic function. Using a photometric assay we found a specificity of 87.5% and a sensitivity of 80%. Beyond the first year of life the lowest limit of normal values is 72 micrograms chymotrypsin/g stool. The method is reproducible, and a 72-hour stool collection is unnecessary when several fecal chymotrypsin determinations in spot stool samples are performed.