The purpose of these pages is to provide surgeons with the ability to calculate a mortality risk online for their patients using the ACPGBI Malignant Large Bowel Obstruction (MBO) model. Malignant large bowel obstruction is a high-risk condition, occurring in 15% of patients presenting with colorectal cancer. The model is based on data from a prospective multicentre study. The model can be applied in everyday practice as an adjunct to the process of informed consent.


Calculate an ACP MBO Score

Choose a value in each category that matches your patient from the drop down lists in both the physiological and operative parameters tables below. Default values (the lowest score) are shown for each category.


Age Group
ASA Status
Cancer Staging
Operative Urgency