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Elastase: two different results


My 12-month-old son had last month an elastase assay which showed a moderate exocrine pancreatic insufficiency. 15 days later, a new analysis indicates that there is no failure.
Which value should we believe?
The only difference between the two tests is the type of diet. Can it affect the results?
Thank you
It is difficult to answer without knowing the values ​​and the difference between the two values ​​(small difference?). Nutrition has no significant influence on fecal elastase concentrations.
It is more usual, to have during the first year a first elastase assay to be normal and a second analysis, which shows an exocrine pancreatic insufficiency. An abnormal value shows that pancreatic function is impaired. It would be interesting to carry out a new analysis.
Pr M. Abely