Laboratory Studies
- Obtain CBC count, liver function tests, and blood cultures.
- Common laboratory findings include leukocytosis, hyperbilirubinemia (patients with a malignant obstruction generally have a significantly higher bilirubin level than those with a benign obstruction), and elevated alkaline phosphatase levels.
- Other possible laboratory findings include elevation of transaminases and serum amylase levels (due to possible concurrent pancreatitis from stone impaction at the ampulla of Vater).
- Blood culture findings are positive in nearly 50% of patients.
- Bile culture findings are positive in nearly all patients.
- Multiple organisms are identified in approximately 60% of patients. Commonly reported aerobic organisms include Escherichia coli and Klebsiella and Enterococcus species. The most commonly reported anaerobic organism is Bacteroides fragilis.
Imaging Studies
- Abdominal ultrasound
Procedures
- The following procedures may be used for diagnostic and therapeutic purposes:
- Endoscopic retrograde cholangiopancreatography (ERCP)
- Percutaneous transhepatic cholangiography (PTC)
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