A hydrogen breath test is a quick and non-invasive procedure that determines how your body digests different kinds of sugars by measuring the levels of gas you exhale.

If you are living with a disease or condition that affects you liver, it is important for your doctor to regularly monitor you for any scarring or fat deposits (called fibrosis) that may affect the health of your liver.

An endoscopy, which may also be called an upper endoscopy or upper gastrointestinal endoscopy, is a minimally invasive procedure to diagnose and treat certain conditions affecting the upper part of the gastrointestinal tract, which includes the esophagus, stomach, and upper part of the small intestine.

A nuclear stress test is used to gather information about how well the coronary arteries provide blood flow to the heart muscle (myocardium) during physical activity and at rest.