This paper explores a quantitative methodology based on a probability distribution Logit to establish priorities in the selection of patients accumulated waiting in lists for surgery services in the Health services institutions. A set of associated factors at the surgical intervention results was evaluated, such effect of the interaction between the patient's pathology and the IPS operative skills, for to estimate the achieved impact in the improve of the patient's quality life through an index in interval scale. This way of prioritizing overcomes the limitations of the results of traditional instruments for measuring the variable, through a more efficient selection model.