Complex sentence: Endoscopy can be used to localize the cause of the protein loss in the bowel.Different methods include faecal excretion of alpha 1-antitrypsin which is a marker of protein-losing enteropathy, as well as, viral serologies which may be useful to detect PLE.
Split into simpler sentences: Endoscopy can be used to localize the cause of the protein loss in the bowel. Faecal excretion of alpha 1-antitrypsin is a marker of protein-losing enteropathy, as well as, viral serologies which may be useful to detect PLE.