 A half-life of greater than 2.8 days has been quoted as normal.The SeHCAT test is used to investigate patients with suspected bile acid malabsorption, who usually experience chronic diarrhea, often passing watery feces 5 to 10 times each day.When ileum has been removed following surgery, or is inflamed in Crohn's disease, the 7-day SeHCAT retention usually is abnormal, and most of these patients will benefit from treatment with bile acid sequestrants.