Identifies a serum protein produced by the liver and choroid plexus that forms the basis of one subtype of amyloid. This protein can serve as a marker of choroid plexus tumors.
• Formalin-fixed, paraffin-embedded (FFPE) tissue block or cell block - OR - • 3 unstained slides for each test requested plus 1-2 additional unstained slides cut at 4µm