An assessment was made of the predictive capacity of the following predictive formulation named Nutritional Sepsis Risk: NSR = 14.26 - 1.76 (albumin) - 1.47 (risk area) This was done in a sample of 65 surgery patients with digestive pathology who were candidates for selective surgery. All had undergone a pre-operative nutritional evaluation program, based on anthropometric and analytical data and Retarded Hypersensitivity Cutaneous Tests (RHCT). NSR was calculated pre-operatively. Infections were assessed qualitatively and quantitatively using Elebeute and Stoner's sepsis index. There were a total of five post-operative infections (7.69%). The NSR intersection point was calculated with an ROC curve, situated in a score of 3. The NSR detected the five infections, so is 100% sensitive, with 70% specificity and, in the detection of the septic risk population, surpassed the other nutritional parameters, whether anthropometric or analytical, and the RHCTs, when they were studied individually.