Hello, I'm a medical professional with a focus on gastrointestinal health. When discussing the gallbladder, it's important to clarify that the term "ejection fraction" is typically used in the context of the heart's ability to pump blood, not the gallbladder's function. However, we can discuss the gallbladder's contractile function in terms of its ability to empty bile into the small intestine during digestion.

The gallbladder's ejection fraction, if we were to use this term, would refer to the percentage of bile it releases during contraction. A normal gallbladder is capable of contracting and releasing a significant portion of its bile content when stimulated by the hormone cholecystokinin (CCK), which is released after a fatty meal.

In medical studies, the ejection fraction of the gallbladder can be measured using techniques like cholecystokinin-stimulated hepatobiliary scintigraphy (also known as a HIDA scan). A normal gallbladder typically contracts and releases more than 70% of its bile content in response to CCK.

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The normal gallbladder ejection fraction ranges from 35% to 75%. If you're having pain that suggests gallstones but no stones are present, this is called acalculous biliary pain (ABP). "Acalculous" simply means "no stones," and "biliary" means related to bile, bile ducts and systems.read more >>