The gallbladder serves as a reserve keeper of bile produced by the liver. When stimulated, the gallbladder pushes the stored bile into the duodenum. Gallbladder contractions are stimulated by local hormones such as cholecystokinin, gastrin, cecretin etc. These hormones are produced by the cells of the duodenum and stomach as food enters the organs. Biliary salts from bile are important for digesting fats in the food. A HIDA-scan is used to calculate the ejection fraction of the gallbladder after stimulation by the hormone cholecystokinin. Less than 35% is considered an abnormal ejection fraction. People with abnormal ejection fractions that have already excluded possible organic disorders of the gallbladder (cholecystitis, gallstones, tumors…) are diagnosed with "biliary dyskinesia". Biliary dyskinesia is a functional biliary disorder wherein the gallbladder produces painfully ineffective contractions in order to push the bile into the duodenum. During biliary dyskinesia, the rest of the bile stays in the gallbladder. This condition is treated with a gallbladder removal.