This is a Proprietary Laboratory Analyses (PLA) code, meaning that the code describes only one unique lab test made by a specific manufacturer or performed by a specific lab. Code 0009U describes DEPArray™ HER2 by PacificDx, which involves a tumor–cell isolation procedure followed by fluorescence in situ hybridization (FISH) analysis of the tumor cells to indicate if the HER2 gene, also called ERBB2, is amplified or not amplified.
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