Diagnostic Approach for Mild Malabsorption

Introduction to Diagnostic Considerations

The American Gastroenterological Association suggests that pancreatic cancer is extremely unlikely in a 41-year-old patient with isolated mild malabsorption and no other symptoms, and does not warrant immediate imaging, with a pre-test probability that is extremely low 1, 2

The European Society for Medical Oncology recommends beginning with faecal elastase-1 testing to assess pancreatic function, with normal values being 200-500 μg/g, mild-to-moderate insufficiency being 100-200 μg/g, and severe insufficiency being <100 μg/g 5, 2
Abdominal ultrasound is useful for initial examination of the pancreas if faecal elastase-1 is abnormal, and can identify obvious structural abnormalities, masses, or ductal dilation without radiation exposure 8, 2

The National Institute for Health and Care Excellence suggests investigating small bowel enteropathy, bile acid malabsorption, small intestinal bacterial overgrowth, and chronic giardiasis or other parasitic infections as alternative diagnoses for mild malabsorption 3, 2, 4, 5
The American College of Gastroenterology recommends reserving surveillance with annual endoscopic ultrasound and/or pancreatic MRI for high-risk individuals with genetic predisposition, familial pancreatic cancer, or hereditary syndromes, typically beginning at age 50 years or 10 years earlier than the age of the youngest affected relative 6, 2

The American Gastroenterological Association advises against over-imaging low-risk patients, as the extremely low pre-test probability makes advanced imaging inappropriate and potentially harmful through incidental findings 2
The European Society for Medical Oncology recommends against misinterpreting mild symptoms, as mild malabsorption alone should not trigger a pancreatic cancer workup, and against ordering CA19-9 prematurely, as this biomarker has insufficient sensitivity and specificity for screening 7, 1, 2