<prompt> Schillings test may be used to establish a diagnosis of :Intrinsic factor deficiencyPancreatic Endocrine dysfunctionMegaloblastic anemia from folic acid deficiencyAll of the above  <response>: Answer is A Intrinsic factor deficiency Shillings test is typically done to determine the cause of cobalamine malabsorption Vitamin B12 malabsorption. A diagnosis of Intrinsic factor deficiency can be established if radiolabelled cobalamine Vitamin B12 appears in urine after administration of Intrinsic factor. Schilling test is abnormal in conditions that affect cobalamine absorption including Intrinsic Factor Deficiency in Pernicious anemia, Exocrine Pancreatic Dysfunction in Chronic Pancreatitis, Bacterial overgrowth syndrome and Ileal dysfunction. 