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The accuracy of any laboratory test is largely dependent upon properly obtained samples submitted for testing. Improper sampling techniques can compromise test results regardless of how sensitive and sophisticated the analytical instrumentation used. If proper collection protocols for obtaining hair samples for mineral testing are not followed, the clinical validity of the trace element results can be markedly compromised. The reason for collecting samples from several different locations is due to the variation in the growth and/or resting phase of hair follicles. It is known that the test results of samples taken from only one location can be different when compared to a sample taken from a different location. It should be noted that there have been numerous incidences of contamination of samples from the use of low-grade metal scissors that have deteriorated. It is imperative that samples are properly obtained to insure proper interpretation of the results.
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