This test is sufficient to diagnose FAP and is initiated from the age of 10 for at-risk children of an affected parent. Flexible sigmoidoscopy may be done in the doctor's office after a 24-hour bowel preparation. Sedation is not required. Detailed exploration of problem areas in the large intestine may be carried out. Polyps may be biopsied or removed through the colonoscope.
Light sedation is required, along with a specific bowel preparation.
Moreover, if polyps are observed, the patient will have to return for a scope and biopsy to confirm the type of polyp and degree of change within the polyp.