KIDNEY STONE

This study planned to test a device called RetroPerc that helps doctors reach and remove large kidney stones. It was designed for adults with kidney stones larger than 10 mm. However, the study was withdrawn before any participants were enrolled, so no results are available.

This study looks at whether losing weight with a special very low-calorie diet (Optifast) can lower oxalate levels in urine for obese adults who have had calcium oxalate kidney stones. Fourteen participants will eat a low-oxalate diet and provide urine samples before and after th…

This study compares two schedules for shockwave lithotripsy (ESWL) to treat kidney stones 8-15 mm. 600 participants will receive two ESWL treatments either in the same week or three weeks apart. Researchers will measure how quickly stones clear, complication rates, and patient qu…

This study looks at whether drinking lemonade (Crystal Light) and taking potassium citrate can improve urine chemistry in people who have had kidney stones and have low citrate or acidic urine. Ten adults will try each combination for a week and collect their urine for 24 hours. …

This study looks back at the medical records of 3000 people who had kidney stones removed using one of two new devices: the CVAC system, a steerable suction catheter, or a special suction tube called FANS. Researchers want to see how well each device clears stones and how safe th…

This study compares two laser methods for breaking up kidney and ureteral stones during surgery. One method uses standard laser pulses, the other uses a newer 'Moses 2.0' pulse mode. Researchers want to see if the newer mode reduces surgery time and improves stone clearance. Abou…

This study tests whether using a smaller ureteral stent (4.8 Fr instead of 7 Fr) reduces pain and discomfort after kidney stone surgery. About 100 adults who need a stent after surgery will be randomly assigned to one of the two sizes. Patients will report their pain daily until …

This pilot study tests whether daily meditation can improve recovery for children and adults having surgery for kidney stones. Participants will be randomly assigned to either a meditation group or a control group. Those in the meditation group will practice a daily 20-minute gui…

This study looks at how vitamin C (ascorbic acid) turns into oxalate, a key component of kidney stones. Researchers will give a special labeled vitamin C to 136 adults—both with and without kidney stones—and measure how much oxalate ends up in their urine. The goal is to understa…

This study looks at how oxalate, a compound found in spinach, affects the energy use of white blood cells in healthy adults. Researchers will give participants a spinach smoothie and measure changes in immune cell function over five hours. The goal is to better understand how die…

This study tests a web-based tool called WellPrept that gives patients clear information before their urology procedures. Researchers want to see if it helps patients feel more confident and understand their condition better, and if it shortens clinic visits. About 300 men and wo…

This study looks at how being obese might increase the amount of oxalate your body makes, which can lead to kidney stones. Researchers will give 40 adults (half obese, half not) a special diet and measure their urine oxalate levels. The goal is to understand the link between obes…

This study looks at how obesity changes the way the body handles oxalate, a substance that can form kidney stones. Researchers will give 22 calcium oxalate stone formers a controlled low-oxalate diet and a special tracer to measure oxalate absorption, kidney handling, and natural…

This study was designed to measure how often urine flows backward from the bladder into the ureter after placing a special stent (RELIEF) in people with kidney stones. Researchers planned to use bladder X-rays to check for reflux and track any symptoms. However, the study was wit…

This study follows 1,600 people with small kidney stones (4 mm or less) to see how often they pass without help. Participants report symptoms, give blood, and get a follow-up CT scan. The goal is to find out if pain, stone size, or location can predict natural passage within 4 to…