A 55 year old woman presents with intermittent abdominal pain for 1 year. She describes it as crampy in nature and is associated with bloating, soft stools and fatigue. The pain is usually relieved by opening her bowels. There has been no fever, weight loss or rectal bleeding. There is however the presence of mucus in the stool. Based on the symptoms, you believe that she may have Irritable Bowel Syndrome (IBS). There is no family history of bowel or ovarian cancer and abdominal and rectal examinations are normal.
Which one of the following options outline appropriate tests to be performed?