It sounds like the Cleveland Clinic does the most thorough biopsy if they check three sites. I watched the online instructional videos for both Johns Hopkins and Therapathy (a pathology lab for identifying neuropathy).

Johns Hopkins tells the doctor to inject the anesthetic subcutaneously right into the spot where the sample will be taken. Therapath has the doctor inject anesthesia around the perimeter of the site but says not to put the needle into the biopsy area to preserve the nerves. Therapath also made it clear not to touch the top of the skin when removing the sample.

I'm nowhere near the Cleveland Clinic so will have to use one of the labs. I'm going to see if the University of Colorado has a pathologist that is trained to identify the various nerve conditions. I really want it to be done right the first time...

Jan