Mercury levels, along with other metal and mineral levels, are important to test when brain or nervous system problems occur. This can be ADHD, Autism, Dementia, Alzheimer's or other problems.
This is the best labwork I can find for testing mercury levels, along with minerals and metals. It is the lab recommended in the book The End of Alzheimer's. Required sampling is blood, hair, and urine. Blood can be collected here at my clinic, or if you are not local it can be arranged through labstogo.com
The blood draw can be scheduled anytime; it does not have to be shipped overnight like some of the other labwork so afternoon draws are OK.