Once the kidney tissue sample is obtained, it is processed in the laboratory. The sample is embedded in paraffin, sectioned into thin slices, and stained with various dyes. These stained sections are then examined under a microscope. Common staining techniques include Hematoxylin and Eosin (H&E), which helps identify the general structure and cellular detail, and special stains such as Periodic Acid-Schiff (PAS), which highlights the basement membrane and other specific structures.
