Here are links to information on Serum Trypsinogen. This test is often used to help determine pancreatic function in SDS kids.
http://www.nlm.nih.gov/medlineplus/ency/article/003560.htm
http://www.umm.edu/ency/article/003560.htm
http://www.labtestsonline.org/understanding/analytes/trypsinogen/test.html
http://www.healthcentral.com/ency/408/003560.html