What is involved in cholecystokinin (CCK) test in the workup of exocrine pancreatic insufficiency (EPI)?

Updated: Aug 12, 2021
  • Author: Samer Al-Kaade, MD; Chief Editor: Romesh Khardori, MD, PhD, FACP  more...
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Use of a CCK receptor agonist (eg, cerulein) as a hormonal stimulant provides information on pancreatic enzyme-secreting capacity. Two endoscopic tubes are placed: (1) a single-lumen gastric tube and (2) a double-lumen duodenal tube. The gastric tube continuously collects and discards gastric fluid to prevent acidification of the duodenum. One duodenal lumen continuously collects duodenal drainage fluid, whereas the other is used for administration of a mannitol-saline solution containing a nonabsorbable marker (polyethylene glycol [PEG]).

An accurate determination is made of enzyme concentration, enzyme output, and fluid volume on the basis of recovery of the PEG marker. Measurement of perfusion markers requires a specialized laboratory.

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