How might a tracer be used to diagnose a digestive problem?

The radioactive tracer (radiopharmaceuticals) is used to assess bodily function and diagnosing and treating the disease. It is made up of carrier molecules bondeed tightly to radioactive atom. Some interact with specific protein or sugar in the body of the person. Radioactive tracer can be administered through intravenous injection, inhalation, oral ingestion, or direct injection into an organ.