--they can look for the granulomas of sarcoid in the small-fiber nerves from a skin biopsy, and parts of the sample can be stained with Congo Red to look for signs of coiled amyloid proteins. But this probably has to be specifically requested by the doctor involved; I don't think it's automatic with the electron microscopy.

In my case, we went back to look for amyloid in the preserved samples from my first skin biopsy some months after it was first analyzed--negative, fortunately.