Establishing a Pediatric Reference Range for the 13C-Spirulina Gastric Emptying Breath Test (GEBT)

Inclusion Criteria: Children ages 7 to 18 years who provide written assent and whose parents provide written consent for participation Healthy and without any significant prior medical history or developmental delays Able to eat the test meal and provide breath samples.- Exclusion Criteria: Any known physician-diagnosed medical (gastrointestinal, pancreatic, or liver disease that may cause malabsorption, neurological) or psychiatric disease Chronic pulmonary disease including moderate/severe reactive airway disease requiring treatment with a daily inhaler Type 1 or 2 Diabetes Chronic gastrointestinal symptoms or functional gastrointestinal disorders Mental retardation or pervasive developmental disorder Currently receiving prescription drug therapy that may affect gastric motor function or sensation Any over-the-counter or herbal supplements that may affect gastric motor function or sensation Allergy to Spirulina, egg, milk, wheat or gluten (unless consuming gluten free crackers with the test meal) or known intolerance to any ingredient in the test meal