The AB Design can be used to quickly assess the effects of an experimental variable. Its main disadvantage its inability to distinguish the experimental effect from possible confounds that might occur coincident with the change of condition.
ceÂ·liÂ·ac disÂ·ease. A disease occurring in children and adults characterized by sensitivity to gluten, with chronic inflammation and atrophy of the mucosa of the upper small intestine; manifestations include diarrhea, malabsorption, steatorrhea, and nutritional and vitamin deficiencies.
No discussion of allergy testing would be complete without addressing gluten sensitivity and gluten intolerance. Celiac disease, also known as gluten-sensitive enteropathy, is a food intolerance that affects individuals with a genetic predisposition to react to gliadin, a gluten protein found in wheat, barley, and rye.