Hair Test Is There A Hair Test Laboratory To See Hair Contents?

Is there a hair test laboratory to see hair contents? - hair test

I am interested to know whether there are labs, so that doctors samples of hair (the hair can take, but it is only through the skin) for the results as the amount of potassium.

A doctor testified that has for many years, but maybe he has with his own team. I know that their results are not as good as a blood test and have blood taken and I expect results.

Few of these tests are given in the rule, but a little hair surface would know I want to give up so easily. David Letterman's hair was in each of his performances, if not impossible to analyze.