render the patient stone–free. Currently, no standardized method is available to predict the stone–free rate after PCNL. This study will validate the

use of Guy’s stone score in predicting the stone–free rates after PCNL.

METHODS: Total 107 cases were studied from 1st March 2016 to 30th December 2017 who were diagnosed as a case of renal calculi and

underwent PCNL at the NYTIM’s Raigad medical Institution , Karjat. The Guy’s stone score was independently applied to consecutive PCNL

cases according to the preoperative imaging findings.

RESULTS: Mean age of cases considered for study purposes was 43.64 years. Multiple calculi were seen in 12.5%, while a staghorn calculus was

seen in 4.8%. 70% of the cases were left stone free in with overall success rate (SR) of 91.5 %. The SR for cases having Guy’s score grade I is 100%,

while it is 95% for grade II, 61.5% for grade III and 60% for grade IV.

CONCLUSION: Findings of the study reveals that as the Guys score grading increases the success rate decreases and the possibility of

complications to be encountered increases. Guys score may improve the accuracy of preoperative counselling.