CPT® Code 88372

Protein analysis of tissue by Western Blot, with interpretation and report; immunological probe for band identification, each

The CPT® Code 88372 refers to a laboratory procedure known as protein analysis of tissue using the Western Blot technique, which includes interpretation and reporting. This procedure is specifically designed to isolate and identify proteins present in a tissue sample. The Western Blot method is a widely utilized technique in molecular biology and immunology for detecting specific proteins in a sample. It involves the use of an immunological probe for band identification, which is crucial for accurately determining the presence and quantity of proteins of interest. The tissue sample required for this analysis must be obtained through a separately reportable procedure, ensuring that the sample is properly prepared for analysis. The preparation process involves breaking down the tissue and adding buffers that lyse the cells, thereby stabilizing the proteins for further examination. Additionally, a chemical inhibitor may be introduced to the sample to prevent any denaturation or degradation of the proteins during the analysis. Once prepared, the sample is diluted with a loading buffer, which typically contains glycerol and dye, and is then loaded onto a gel for electrophoresis. During electrophoresis, the negatively charged proteins migrate towards the positively charged anode, allowing for their transfer onto a solid support membrane. After the proteins are blotted onto the membrane, it is essential to block the membrane to minimize any unwanted interactions between the membrane and proteins in subsequent steps. The analysis continues with the addition of antibody probes to visualize the proteins of interest. A primary antibody specific to the target protein is applied, followed by washing the membrane and adding a second labeled antibody. This labeled antibody binds to the primary antibody, enabling the detection of the protein through imaging techniques such as photography or scanning. The pathologist then interprets the results, confirming the presence of the targeted protein(s), estimating their quantity through visual inspection, and determining their size by comparing them to standardized markers. Each antibody probe utilized in this process is reported under the CPT® Code 88372, ensuring accurate documentation and billing for the procedure.