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Steven J. Steindel, PhD; Peter J. Howanitz, MD

JAMA. 2001;285:83-85.

	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

In 1985, an article by Barrett¹ published in THE JOURNAL addressed several issues related to the use of trace metal hair analysis for assessing nutritional status. Now, in this issue of THE JOURNAL, Seidel and colleagues² show that many of same concerns raised 15 years ago by Barrett's study remain unresolved. Both studies used a self-prepared split sample that was sent to several laboratories specializing in trace metal analysis of human hair. Both noted the divergence of results obtained and the health-related claims made. Seidel et al also commented on the current regulatory environment that hair analysis laboratories now face.

Accuracy of laboratory tests is best ensured through the use of standards of known value to calibrate tests. Internationally recognized groups, such as the National Institute of Science and Technology, provide standard materials of known value, and other organizations, such as the . . . [Full Text of this Article]

Author Affiliations: Laboratory Practice Assessment Branch, Division of Laboratory Systems, Public Health Practice Program Office, Centers for Disease Control and Prevention, Chamblee, Ga (Dr Steindel) and Department of Pathology, University Hospital, State University of New York, Health Science Center at Brooklyn, Brooklyn (Dr Howanitz).

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