The most common is disaccharidase deficiency. There s primary or secondary lactase deficiency. I typically do a dietary trial but you can also do lactose hydrogen breath tests. The treatment can be with LactAid and dietary restriction. Most patients can tolerate 8 ounces of milk so that s usually not a problem.
Celiac sprue is an immunologic response to gluten.
The diagnosis is based on an abnormal biopsy. This is just suggestive of the disorder. It s confirmed by restriction of gluten in your diet. This is tough. Complications are lymphoma, squamous cell carcinoma of the esophagus, ulcerations and carcinoma.