All values must be present before the calculation can take place.
Surgical severity will be calculated automatically on entry of procedure details.
If the procedure you are searching for is not listed, please use the nearest available procedure for calculation.
We support open research and coding. If modifying the tool and/or formula (remix, transform or build upon it), the calculator cannot be called SORT. Furthermore, we cannot be held responsible for any technical errors that might occur in your final product.
The SORT is a preoperative risk prediction tool which estimates the risk of death within 30 days of inpatient surgery.
The original SORT model and this website were developed as a collaboration between NCEPOD researchers (Karen Protopapa and Neil Smith; www.ncepod.com) and clinicians working within the UCL/UCLH Surgical Outcomes Research Centre (uclsource.com)
Since the SORT model was originally published, several papers have re-evaluated it in different cohorts and for different purposes.
The most recent large-scale update (published in PLOS Medicine in 2020 and based on data collected in the UK, Australia and New Zealand) supports the new SORT-clinical judgment model over the original SORT model. Additionally, and unlike the original SORT model, this new model demonstrates good accuracy in neurological/spinal and cardiothoracic surgery.
Our recommendation is that the new combined-SORT clinical judgement model is used, and the clinical estimate provided by senior decision-makers and (ideally) the multi-disciplinary team.
Intellectual property: the SORT equations are available from open access peer-reviewed publications. Please cite these as appropriate:
If you experience any problems then please