Which lab tests are performed in the workup of choledochal cysts?

Updated: Jul 01, 2020
  • Author: Emily Tommolino, MD; Chief Editor: BS Anand, MD  more...
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No laboratory studies are specific for the diagnosis of a choledochal cyst, but some may be used to narrow the differential diagnosis. The following tests may be helpful:

  • Complete blood count with differential: Elevated white blood cell count with increased numbers of neutrophils and immature neutrophil forms may be noted in the presence of cholangitis

  • Liver function studies: Elevated hepatocellular enzymes and alkaline phosphatase levels are nonspecific for choledochal cysts

  • Serum amylase and lipase levels: Both may be elevated in the presence of pancreatitis, but they can also be elevated in the presence of biliary obstruction and cholangitis

  • Serum chemistry levels: Results may be abnormal if the patient is vomiting (hypochloremic, hypokalemic metabolic alkalosis)

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