Bilirubin is a brownish yellow substance found in bile. It is produced when the liver breaks down old red blood cells.
Aspartate Aminotransferase (AST)
An aspartate aminotransferase (AST) test measures the amount of this enzyme in the blood. AST is normally found in red blood cells, the liver, heart, pancreas, kidneys, and muscle tissue.
A stool analysis is a series of tests done on a stool (feces) sample to help diagnose certain conditions affecting the digestive tract. These conditions can include infection (such as from parasites, viruses, or bacteria), poor nutrient absorption.
A barium enema, or lower gastrointestinal (GI) examination, is an X-ray examination of the large intestine (colon and rectum). The test is used to help diagnose diseases and other problems that affect the large intestine.
Upper Gastrointestinal (UGI) Series
An upper gastrointestinal (UGI) series examines the upper and middle portions of the gastrointestinal tract (intestines) using contrast material, fluoroscopy, and X-ray.
Alanine Aminotransferase (ALT)
An alanine aminotransferase (ALT) test measures the amount of this enzyme in the blood. ALT is found mainly in the liver, but also in smaller amounts in the kidneys, heart, muscles, and pancreas.
An abdominal X-ray provides a picture of structures and organs in the abdomen, such as the large and small intestines, stomach, liver, spleen, and diaphragm, the muscle that separates the chest cavity and the abdominal cavity.
Bowel Transit Time
A bowel transit time test measures how long it takes for food to travel through the digestive tract. Bowel transit time depends on what types of food you eat and how much you drink.
D-Xylose Absorption Test
The D - xylose absorption test measures the level of D - xylose, a type of sugar, in a blood or urine sample.
An ammonia test measures the amount of ammonia in the blood. Most ammonia in the body forms when protein is broken down by bacteria in the intestines.