Tubular urine is a cylindrical mass formed by the coalescence of proteins in the lumen of the kidney tubules. In a normal person, there should be less than 5,000 tubular patterns in 12 hours of urine, containing 2 to 5 per milliliter of urine, or less than 1 per low magnification view. A small number of clear and cellular granular tubular patterns may be present in normal human urine. If there is an increase in tubular patterns in the urine, it is called tubular urine. In some cases cells or granules tend to accumulate together, resembling a tubular pattern. It is characterized by short lengths, varying widths, and uneven edges, and must be identified with care. If there are more than two kinds of cells in the tubular type, it can be called compound cellular tubular type, with overlapping and interlocking cells and blurred margins, especially under unstained and ordinary light microscopic conditions, it cannot be accurately identified, and can be collectively called cellular tubular type. 2, renal tubular epithelial cell tubular type also known as renal epithelial cell tubular type. Because the tubular type is formed in the renal tubule, the epithelial cells that are included are the tubular epithelial cells that are shed in the wall of the renal tubule. It can be divided into two categories, one is composed of shed tubular epithelial cells and T-H protein, and the sheets of epithelial cells are separated from the basement membrane, and the shed tubular epithelial cells stick together; the other category is for acute tubular necrosis, the cytosol is larger, the formation is variable, and the typical epithelial cells are arranged in a tile-like pattern and filled with tubular type, the cells are of different sizes, the nuclear shape is blurred, and sometimes light yellow. This tubular type is often difficult to distinguish from leukocyte tubular type, but the tubular tubular epithelial cells within the tubular type are slightly larger than leukocytes, can be polygonal, and have more complex morphological changes than leukocytes, containing a larger nucleus, which can be rendered by acid addition method. Esterase staining is positive and peroxidase staining is negative, which can be used to differentiate the tubular type from leukocytes.