The size of kidney stones is typically measured using imaging techniques and occasionally during surgical procedures. Here’s how it’s done: Imaging Techniques: Ultrasound: Kidney stones can be visualized using ultrasound imaging. The size is often measured in millimeters (mm) as the maximum diameter of the stone. CT Scan (Computed Tomography): This imaging technique provides detailed images of the kidneys and urinary tract. It accurately measures the size of kidney stones in three dimensions (length, width, and depth), usually reported in millimeters. 2. Measurement During Surgery: During procedures such as ureteroscopy or percutaneous nephrolithotomy (PCNL), which involve the removal or fragmentation of kidney stones, the size of the stone can be directly measured using specialized instruments. Stones are often measured in their fragmented state as pieces are extracted. 3. Measurement Units: Kidney stone sizes are typically reported in millimeters (mm). Larger stones may also ...