Conclusion:
In kidney stones larger than 2 cm, the most important parameter determining the benefit of the UAS and general infective complications in terms of infective process is the operation time. While the risk of infection increases when the operation time exceeds 60 minutes, FURS can be safely performed up to 87.5 minutes in terms of infection risk, with 89% sensitivity and 69% specificity.
Acknowledegements: None
Conflicts of interest: The authors have declared that they have no conflicts of interest.
Funding: None