But what if my neuro only took a biopsy from both calves and not the ankle or upper leg.

--with known values from "normal" patients at that location.

Still, more comprehensive testing would involve the other sites as well--and doing the biopsy at multiple sites might also show whether any reductions in intraepidermal nerve fiber density were dependent on the length of the nerves, which can have some diagnostic value in some cases.

I also suspect they don't do the foot, because injuries/wounds on feet don't heal well. Many PNers have diabetes, and part of their monitoring is to avoid injuries to the feet!

Rec'd my biopsy results. Test results say "Density of epidermal nerve fibers in normative range."
However, I had "degenerative changes within epidermal nerves." "These findings are often predictive of the future development of clinical neuropathy"
"Mild Morphologic degenerative changes are seen among intra-epidermal nerve fibers."
"Epidermal nerves are mildly patchy in distribution.Occasional epidermal nerves are varicose in appearance."
It goes on and on about the microscopic description.
I failed "Tinel's Sign" diagnosis and EMG studies were inconclusive.
(I failed one foot and passed the other)
Neuro thinks Tarsal Tunnel and favors injections or MRI next.
What do you guys think?

And, were there comparisons among nerves from different parts, if they were done?

Looks to me like you might have caught the neuropathy developing or at an early stage, in which there are degenerative changes but not enough of those to put your intraepidermal nerve fiber density outside of the statistical norms as of yet.

Biopsy was only taken from each calf location.

even cat scan route before trying the tarsal tunnel injections. Does this neuro do tarsal surgeries? IF so? Be veerry cautious. Few here have had long term success from such procedures. Altho short term relief can be found with injections. Nothing is long term nor a cure.
I wish I could be more optimistic? But, following a regime of Vitamins B-1, B-12, calcium w/magnesium and D can help off set a good deal of damages many encounter here. Do take a look at all the Mrs D has to say, please. She is one who suffers from PN but has been able to manage it far better than most and knows all about the supplements one needs to help your body heal and get better. Doesn't work overnite? But, it does help a great deal!
Hugs and hope truly ! - j