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POLARS Calculator

Preoperative prediction of LARS syndrome

POLARS (Pre-Operative LARS Score) is a prediction tool that estimates the risk of bowel dysfunction (LARS syndrome) after rectal cancer surgery, based on clinical data available before the procedure.

Fill in all fields and press "Calculate" to obtain the estimated LARS score.

Note: External validation studies have shown moderate prediction accuracy (~39% category concordance). The tool tends to overestimate symptom severity. Use the result as a starting point for the discussion with your surgeon, not as a certainty.

years
2 Sex
3 Type of planned surgery
cm

Distance from the anal verge to the lower edge of the tumor, measured by rigid rectoscopy.

5 Is a protective stoma (ileostomy) planned?
6 Preoperative (neoadjuvant) radiotherapy?

Already had surgery?

Assess your current symptoms with the LARS Score Calculator, a validated questionnaire for measuring postoperative bowel dysfunction.

LARS Score Calculator →

Scientific reference

Battersby NJ, Bouliotis G, Emmertsen KJ, et al. Development and external validation of a nomogram and online tool to predict bowel dysfunction following restorative rectal cancer resection: the POLARS score. Gut. 2018;67(4):688-696. PubMed