CPT® Code 82355

The CPT® Code 82355 refers to the qualitative analysis of renal calculi, commonly known as kidney stones. This laboratory test is essential for understanding the characteristics of these stones, which can form when certain chemicals precipitate and crystallize as the kidneys filter blood and produce urine. The resulting crystals may consist of various minerals, including calcium, magnesium, and cysteine. Kidney stones can lead to significant health issues, such as obstructing urine and blood flow within the kidneys or dislodging and traveling down the ureters. This movement can cause stretching, irritation, and potential damage to the ureteral walls. To conduct the qualitative analysis, urine is collected in a clean container and strained through a fine mesh to capture the calculi. Once collected, the stones are brought to the laboratory, where they undergo a series of steps including washing, drying, weighing, and measuring. The qualitative characteristics of the stones are observed, noting their texture—whether they are rough, smooth, horned, or waxy. Additionally, the stones are cut in half to check for the presence of a nucleus. If a nucleus is identified, it is separated from the shell for individual analysis. In cases where no nucleus is found, the entire stone may be pulverized for further chemical analysis to determine its composition, which includes measuring levels of calcium, magnesium, inorganic phosphate, and oxalate. This comprehensive analysis aids in calculating the stone's overall composition, providing valuable information for diagnosis and treatment.