Answer by
ginny68 (118)
Gallbladder ejection fraction is measured when a condition called acalculous biliary pain is suspected. Acalculous biliary pain is any gallbladder pain that is not caused by stones. During the test CCK, a hormone, is injected and the gallbladder is measured before and after. The amount of CCK that is released from the gallbladder determines the ejection fraction. Normal is 35-75%.