There are a number of responsible, reliable research studies
that identify the potential inaccuracies from using mineral
hair sampling tests. I respectfully disagree with retired
Psychiatrist, Stephen Barrett M.D. review. In my opinion,
scientists may determine conclusions by review of both sides
of an issue. Barrett presents a single-skewed view, while
Sahelian presents a more accurate picture of this question.
I have taken the liberty to "agree too disagree..." and
include a realistic option to refer to the original argument
between alternative medicine practitioner Ray Sahelian M.D.
and retired Psychiatrist, Stephen Barrett M.D.

Ray Sahelian M.D. questions a website published a retired
Psychiatrist, Stephen Barrett M.D.
Quackwatch review by Ray Sahelian, M.D.:

Is Stephen Barrett a Quack?
http://www.raysahelian.com/quackwatch.html

I do agree with my esteemed colleague, Professor Burke,
that hair analysis sampling method pre-treatment technique
and the lab test method may increase the risk of inaccurate
numbers. I do not regard the Barrett reference supportive
of this statement due to it's limitations to reviewing only
one side of the issue. As stated, from having experience and
training in this area, it is indeed controversial, presenting
two sides. If hair samples are properly collected and
technically processed, a number of minerals (perhaps not all)
may be determined by hair analysis. Mineral hair analysis
reflects a circulating mineral level from up to 30-40 days
in approximately a 3/8" hair sample. Blood lab levels
reflect an immediate mineral circulating state, but may
vary modestly from distal tissue mineral sample status,
but may confirm more severe mineral deficiency state. One
of our problems encountered with using hair analysis was
the time it required to collect the sample, US-mail it to
the lab, wait several days for properly analyzed results,
then acting upon the results would be at a time when perhaps
the mineral status would be completely changed. If reliable collection
and lab technique determines mineral deficiency
is confirmed by blood labs within 3-4 days of sample,
it could be a useful tool to measure and resolve mineral
deficiency associated with fatigue.

Bill Misner, Ph.D.
AAMA Board Certified Alternative Medicine Practitioner