People with CIDP, have you been checked for heavy metal poisoning?

For a time they thought my dad had CIDP because the symptoms fit exactly. Because his nerve biopsy came out inconclusive (a test that is helpful but not always performed before giving a diagnosis of CIDP) they continued to search. It finally came out that his problem was actually heavy metals poisoning. It had not been immediately obvious because blood tests only show current exposure, not past or chronic exposure. He got diagnoised following a hair ysis. This meant that chelation was an appropriate treatment but by the time he got this it was too late. He was so sick he could barely walk or sleep. He consequently died of a heart attack. Please get checked for heavy metals if you have this diagnosis.