[The laboratory diagnosis of the intestinal malabsorption syndrome of intestinal origin]

Normal absorption and digestion occurs in sequential stages. In the lumen of the proximal intestine pancreatic enzymes and bile salts transform complex substances in simple products which can be absorbed by the enterocyte and transported by lymphatics or portal veins. Malabsorption syndromes can be secondary to alterations in both digestion and/or absorption process. We herein review the tests used to establish the diagnosis of intestinal malabsorption syndromes with special reference to those available in our country. Finally we propose an algorithm taking into account the frequency of diseases causing malabsorption in Mexico.