The only time I had a heavy metal screen, it came back low in the normal range for Lead.
Big surprise was I was at the top of the range for Arsenic. Turned out the whole basement of the place I lived was painted with very old, peeling, chalking light green paint... And the paint colorant had been a copper arsenic compound. We re-painted the basement in a hurry, and I've moved away since. No more heavy metal problems.