KIDNEY STONE

This study tests whether giving people a live gut bacterium called Oxalobacter formigenes can lower the amount of oxalate in their urine. High urinary oxalate is a major risk factor for calcium oxalate kidney stones. Forty adults with a history of such stones who lack this bacter…

This study tests whether a DASH-style diet (rich in fruits, vegetables, and low-fat dairy) can reduce the risk of kidney stones compared to a typical Western diet. Forty-eight adults with a history of kidney stones will eat specially prepared meals for one week. Researchers will …

This study tests a new ultrasound device that can break kidney stones into tiny pieces and reposition them, all without anesthesia. Researchers will enroll 140 people with small kidney stones to see if the procedure is safe and helps stones pass naturally. The goal is to offer a …

This trial tests a new device called VISOR for removing kidney stones. It combines stone breaking, suction, and pressure control in one tool. About 20 adults with 1-3 cm stones will undergo surgery with VISOR. The goal is to see if it clears stones safely and effectively, with a …

This study compares two long-acting drugs, indapamide and chlorthalidone, to the standard short-acting drug hydrochlorothiazide for preventing calcium kidney stones. About 99 adults who have had at least two kidney stones in the past 10 years will participate. The goal is to see …

This study compares two surgical methods for removing kidney stones: one using a vacuum-assisted sheath and the other using a standard sheath. About 90 adults with stones between 10-25 mm will be randomly assigned to one of the two procedures. The goal is to see which method clea…

This study tests a new type of ureteric stent designed to cause fewer blockages, infections, and less pain than standard stents. About 50 adults who have had stents before for kidney stones or cancer will try the new stent. The goal is to see if it reduces complications and the n…

This study compares two types of lasers (holmium:YAG and thulium fiber) used during a minimally invasive surgery to break up large kidney stones. About 150 adults with stones larger than 15 mm will be randomly assigned to one laser or the other. The goal is to see which laser wor…

This study tests whether combining tamsulosin with either a standard or half dose of tadalafil can better relieve symptoms caused by ureteric stents, such as pain, urgency, and discomfort. Researchers will enroll 140 adults who have a stent placed after kidney stone removal. The …

This pilot study is testing whether a single injection of ketorolac (Toradol), given just before ureteral stent placement, can reduce pain and inflammation afterward. About 36 adults undergoing kidney stone surgery will be randomly assigned to receive either ketorolac or a placeb…

This study looks at whether leaving a stent out after kidney stone surgery can reduce pain and the need for extra medical visits. About 184 adults with kidney or ureteral stones will be randomly assigned to either get a stent or not after their procedure. Researchers will track p…

This study tests whether giving a water pill (furosemide) and extra fluids during laser kidney stone surgery helps clear out tiny leftover fragments. About 374 adults who need this surgery will be randomly assigned to receive either the water pill plus fluids or standard care. Th…

This study tests a flexible suction sheath (FANS) used with a ureteroscope to remove kidney stones from the lower part of the kidney. About 33 adults with lower calyceal stones will be enrolled. The goal is to see if the device helps clear all stones completely.

This study aims to find out if people who get calcium oxalate kidney stones absorb more oxalate from food than healthy people. Researchers will compare stone formers and healthy volunteers by having them eat special diets and measuring oxalate in urine, blood, and stool. The goal…

This study is testing a new ureteroscope that shows surgeons the pressure inside the kidney in real time during stone removal. Researchers want to see if having this information changes how surgeons operate and leads to better outcomes. The study will enroll 80 adults with large …

This study looks at how two natural compounds in food—oxalate and citrate—affect the chance of forming kidney stones. Researchers will measure changes in urine after participants consume sodium oxalate. The goal is to better understand why some people develop stones while others …

This study looks at how two natural compounds in food, oxalate and citrate, interact in the body and affect kidney stone formation. Researchers will measure changes in urine levels of these compounds after participants consume potassium citrate. The study includes 24 adults, some…

This observational study at the University of Chicago looks at how kidney stones are linked to insulin resistance and inflammation. Researchers will measure belly fat, blood markers, and urine in 40 people—half with calcium kidney stones and half without. The goal is to understan…