Mayo Medical Laboratories (Rochester, MN) BRAF Mutation Analysis (V600E), Tumor (Unit Code 87980): The specimen requirements for this assay are an FFPE tumor tissue block or a single H&E-stained 5-μm slide with 10 unstained nonbaked slides with 5 slides, each with 5-μm and 10-μm-thick sections. The gene discussed is BRAF; the disease is neoplasm.