RALUCA COSTINA BARBILIAN, VICTOR CAUNI, BOGDAN MIHAI, IOANA BURAGA, MIHAI DRAGUTESCU, DAN MISCHIANU THE CONTROL OF BLOODLOSS DURING PERCUTANEROUS NEPHROLITHOTOMY USING TRANEXAMIC ACID The aim of this study is to assess the efficiency and safety of the tranexamic acid in reducing hemmorrhagic complications and transfusion requirements in patients with renal lithiasis treated by percutaneous approach. Percutaneous nephrolithotomy (PCNL) is a minimally invasive technique used for large kidney stones (>20mm). Urinary sepsis and intra or postoperative bleeding are the very serious complications associated with this type of procedure. Tranexamic acid is used in the treatment of many haemorrhagic conditions. The experience with tranexamic acid in preventing bloodloss during percutaneous nephrolithotomy is very limited. The use tranexamic acid in percutaneous nephrolithotomy is safe and is associated with reduced blood loss and a lower transfusion rate.