The diagnosis of<unk>  is made by excluding other causes of<unk>  loss. Endoscopy can be used to localize the cause of the<unk>  loss in the bowel. Different methods include faecal excretion of alpha 1-antitrypsin which is a marker of<unk> , as well as, viral serologies which may be useful to detect<unk> .
Protein losing enteropathy
Environmental enteropathy
Radiation enteropathy
Autoimmune enteropathy
Hereditary fructose intolerance
Coeliac disease
Gluten-sensitive enteropathy–associated conditions
Wilderness-acquired diarrhea