Cystic fibrosis causes mucus to become thick and sticky. The mucus builds up and clogs passages in many of the body's organs, but mostly in the lungs and the pancreas. The thick and sticky mucus can block pancreatic enzymes from reaching the digestive system and prevent fat from being digested and absorbed. If the body is not able to digest fat, the fat comes out in stools that are large, greasy, and smelly.
People who have been diagnosed with cystic fibrosis may have a stool analysis to see how well their pancreas is working and how well their bodies are digesting food. It may also be done when cystic fibrosis is suspected because of the following symptoms:
Before having this test, you will eat foods that contain specific amounts of fat. You will keep a record of foods you eat and you will collect samples of your stool. The samples are then sent to a lab where the stools are analyzed for fat content.
A stool analysis is done to see how well the pancreas is working and if pancreatic enzymes are reaching the intestine. This test can help determine whether supplemental digestive enzymes are needed. For people who are currently taking digestive enzymes, this test can help determine if they are taking the right amount.
Increased fat in the stool or low enzyme levels can mean that a person has digestive or pancreatic problems.
Other diseases besides cystic fibrosis can cause fatty stools and pancreatic problems. For more information, see the topic Stool Analysis.
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