Gallbladder Ejection Fraction Measurement and Clinical Significance

Diagnostic Considerations

Normal gallbladder ejection fraction (GBEF) is defined as ≥38% when measured using the standardized cholecystokinin-cholescintigraphy (CCK-CS) protocol with infusion of 0.02 μg/kg sincalide over 60 minutes, as recommended by the American Gastroenterological Association 1, 2
The upper limit of normal GBEF approaches 100%, and historically there was no convincing evidence that a high normal GBEF was of clinical significance, according to the American Gastroenterological Association 3, 4
CCK-CS is the standard test for assessing gallbladder contraction and calculating GBEF, with standardized methodology being critical for reliable GBEF measurement, including infusion of 0.02 μg/kg sincalide over 60 minutes, dynamic imaging, and GBEF calculation at 60 minutes, as recommended by the American Gastroenterological Association 1, 3, 5

Before proceeding with surgery, rule out other causes of upper abdominal pain, including functional gastrointestinal disorders, as recommended by the Rome Foundation 6
Rule out other common causes of upper abdominal pain, such as sphincter of Oddi dysfunction, gastroesophageal reflux disease, and peptic ulcer disease, as recommended by the American Gastroenterological Association 6

Avoid rapid CCK infusion (<30 minutes), as this can cause non-specific abdominal symptoms that confound interpretation, as warned by the American Gastroenterological Association 3, 4
Ensure proper standardized protocol is used for CCK-CS to obtain reliable GBEF measurements, as recommended by the American Gastroenterological Association 1, 3

Confirm GBEF >80% using standardized 60-minute CCK infusion protocol, as recommended by the American Gastroenterological Association 1, 3
Rule out gallstones and other biliary pathology with ultrasound, as recommended by the American College of Radiology 7
Exclude other common causes of upper abdominal pain, as recommended by the American Gastroenterological Association 6