What typical lab tests do you send off for evaluation of neuropathy?

Not too much has changed in over a decade regarding the recommendations on how we should approach initial laboratory testing in patients presenting with a neuropathy syndrome. Specifically for cases of distal symmetric polyneuropathy, the AAN practice parameter (reaffirmed in 2022) by England, et al...

Insurance will deny an HgbA1C test without a diagnosis of diabetes, which then remains on the patient’s list of conditions. How can this be avoided?