A gluten intolerance test is a diagnostic tool used to determine if an individual has a sensitivity or adverse reaction to gluten, a protein found in wheat, barley, and rye. This test helps identify conditions such as non-celiac gluten sensitivity or celiac disease, which can cause a range of symptoms including digestive discomfort, fatigue, and joint pain. By pinpointing gluten intolerance, individuals can make informed dietary choices to improve their health and well-being.