Gastroenterologists are frequently requested to perform endoscopic procedures to rule out cancer or other serious GI disease before major surgical operations.

To assess whether such requests are warranted.

Cost benefit analysis by using decision tree and threshold analysis.

Subjects scheduled for liver and kidney transplant or other major surgeries.

Costs of medical and surgical procedures. The threshold value is defined as the a priori probability for a GI diagnosis, where the benefit of endoscopy changes from unfavorable to favorable as the diagnostic probability increases.

For all types of organ transplants, the threshold probability for diagnosing a GI disease by endoscopy is lower than 1%. Such a low threshold suggests that if a disease cannot be ruled out with certainty before transplant operations or any other major surgical operation, endoscopic screening would be warranted. For lesser interventions, such as percutaneous transluminal coronary angioplasty and coronary bypass grafting, the threshold value varies between 3.2% and 6.5%, which suggests that endoscopic screening may be justified if there are sufficient grounds to suspect a comorbid medical condition that could compromise the success of the planned surgical intervention.

The model only considers procedure costs and assumes no endoscopic complications.

Endoscopic screening before costly and invasive surgical or other medical interventions is justified.