Diagnostic algorithm for biopsy samples to diagnose and classify amyloid
| (1) Haematoxylin and eosin stain, Congo red polarisation |
| (2) Congo red fluorescence |
| If negative: |
| (3A) Serial sections of the whole sample (3B) Electron microscopy |
| (3AA) Haematoxylin and eosin stain, Congo red polarisation |
| (3AB) Congo red fluorescence |
| If positive: |
| (4) Immunohistochemical classification |