CPT® Code 88348

Electron microscopy, diagnostic (CPT® Code 88348) is a specialized laboratory procedure that utilizes high magnification electron microscopy to examine thin sections of tissue at an ultrastructural level. This advanced imaging technique allows for a detailed analysis of cellular structures that are not visible through standard light microscopy. The process begins with the fixation of tissue using chemical agents, followed by dehydration and embedding in epoxy resin to preserve the tissue's integrity. Once the tissue is prepared, a block is trimmed, and the area of interest is selected using light microscopy. Ultrathin sections of the targeted tissue are then collected on copper mesh grids and stained to enhance electron density, making the tissue visible under the electron microscope. This method is particularly valuable in refining and improving diagnoses across various medical conditions. It plays a crucial role in the differential diagnosis of specific renal diseases, such as lupus nephritis and diabetic nephropathy, as well as in identifying various neoplasms and infectious diseases. Additionally, electron microscopy can assist in diagnosing metabolic disorders and conditions with obscure or unknown etiologies, thereby providing critical insights that guide clinical decision-making.