The type of damage are many. No one type of nerve damage to the exclusion of others.

Deficiency would be less likely if the unit of measure is pmol/L, but it would still not rule it out. Some people are much higher than that and still deficient. B12 doesn't work in the blood, and most of the B12 tests will measure things masquerading at B12. There are also other reasons it is not a good test.

rose