Skin Biopsy, examined in lab with types of nerves left counted, taken from wrist or ankle. It will be Yes or No.
IF YOU OR ANYONE YOU KNOW IS MISSING THEIR ANKLE OR WRIST HAIR ON AN OTHERWISE HAIRY FOREARM/LOWER LEG, GET /THEM TESTED IMMEDIATELY. KNOWLEDGE IS POWER, HOWEVER LIMITED TO AVOID PLANNING FOR A LIFE YOU WILL NOT LEAD.