Welcome to the ACS NSQIP Surgical Risk Calculator

Version: 4.0
Last parameter update: June 2023

With this tool you can enter preoperative information about your patient to provide estimates regarding your patient's risk of postoperative complications.

Change in Methodology. The Risk Calculator's risk-estimating methodology has now transitioned from regression to machine learning. This change in methodology will improve the calculator's already excellent accuracy, though differences in estimated risk should not be large. Note, however, that event rates for geriatric-specific outcomes (Postoperative Delirium, Functional Decline, New Mobility Aid Use, and New/Worsening Pressure Ulcer) are still being estimated using regression. Please direct any questions about this change to: [email protected].

Disclaimer: The ACS NSQIP Surgical Risk Calculator estimates the chance of an unfavorable outcome (such as a complication or death) after surgery. The risk is estimated based upon information the patient gives to the healthcare provider about prior health history. The estimates are calculated using data from a large number of patients who had a surgical procedure similar to the one the patient may have.

Please note the risk percentages provided to you by the Surgical Risk Calculator are only estimates. The risk estimate only takes certain information into account. There may be other factors that are not included in the estimate which may increase or decrease the risk of a complication or death. These estimates are not a guarantee of results. A complication after surgery may happen even if the risk is low. This information is not intended to replace the advice of a doctor or healthcare provider about the diagnosis, treatment, or potential outcomes. ACS is not responsible for medical decisions that may be made based on the risk calculator estimates, since these estimates are provided for informational purposes. Patients should always consult their doctor or other health care provider before deciding on a treatment plan.

Risk Calculator Permitted Use: An external platform (e.g., an electronic health record) may open the web address of the ACS NSQIP surgical risk calculator in a new browser window. However, we do not permit the calculator to appear as an integrated feature of any external platform, nor do we permit the functionality of the calculator to be automated in any way. The calculator must be presented in its original, unaltered form, maintaining all ACS branding and copyright information.

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