Project Status

Protocol Development

Collaborator Registration

Audit Registration

Data Collection

Data Analysis

Manuscript Preparation

Submission to Journal



The Outcomes After Kidney Injury in Surgery Study Project Hub


Register for Updates

Register for updates on OAKS here.


Post-operative acute kidney injury (AKI) has previously been associated with increased morbidity, mortality and costs in surgery. Despite the recognition of AKI as a potentially modifiable driver of post-operative morbidity, there is a lack of evidence regarding AKI in the surgical setting. The OAKS study aims to quantify the incidence of AKI in patients undergoing major gastrointestinal and liver surgery and define the morbidity and mortality associated with this. Exploring potential risk factors for the development of post-operative AKI will identify potential targets for service improvement prior to re-audit.


Primary Aim

To audit adherence to guidelines requiring assessment of renal function before
and after major gastrointestinal and liver surgery.

Secondary Aims

  • To determine the incidence of acute kidney injury following major gastrointestinal and liver surgery.
  • To measure morbidity associated with post-operative acute kidney injury.
  • To identify factors predictive of post-operative acute kidney injury.

Getting Started

The OAKS study will be conducted throughout the UK by medical students over the STARSurg network. Local leads at each medical school will coordinate the study. To get involved, simply contact your local lead! Details can be found on the local lead page here.  To receive email updates over the course of the OAKS project or to find out more fill out your details here.


Project Hub Resources

Below are a series of resources and documentation for the OAKS project:



Data Governance e-Learning

AKI e-Learning

Data Collection Form



How to close

REDCap Guide

REDCap Tutorial


Data validation tools for data validators:

Any data validation queries please contact or


Key Steps to OAKS Success

We present below a few key steps to making OAKS a success at your centre.

1. Ensure that audit registration is confirmed at your site.

2. Read the protocol including its annexes in full. These documents contain all the details you need to know to ensure you are collecting and reporting accurate data.

3. Pass the E-Learning module with flying colours. This will ensure a high accuracy and quality dataset.

4. Get geared up to collect and enter data. Ensure you have access to REDCap at least 24 hours before project kick-off. You may use paper forms or Excel sheets first to collect data before transferring them onto REDCap. This should be kept securely. We have released Annex G of the protocol which provides step-by-step guidance.

5. Create an Excel file which will link REDCap Study IDs to NHS IDs. This again should be saved on NHS computers and needs to be done only if no explicit permission has been obtained to store NHS IDs on REDCap.

6. Create a OAKS Study Site File. This can contain hard-copies of full protocol, paper forms, and excel sheets (patient lists)- all essentials for a successful audit. Your junior doctor in the team will be able to advise you on the best place to keep this. Alternatively you may have an e-version of this on a secure NHS computer.

7. Run a pilot day before the official kick-off. Familiarise yourself with the sources of the data you require- the online data system, case notes, etc. This ensures that you hit the ground running from Day 1.

8. Collect data prospectively and proactively. A key quality aspect of the dataset is its prospective nature. Ensure that your dataset is collected as timely and as accurate as possible. Proactively check for complications from a variety of sources frequently- this will include online patient management systems, written medical notes and clinical letters.