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How to prepare your hair for a lab test

https://future-wiki.win/index.php/How_to_prepare_your_hair_for_a_lab_test

Before a lab test, don't wash or treat your hair for at least 48 hours to preserve any external residues, and avoid using gels, sprays, or conditioners that could contaminate the sample. Simply brush or comb it gently to remove tangles, then let it air dry if it's damp. If instructed, collect a small, fresh strand from the root area, avoiding the very tips. Store the sample in a clean, dry envelope or container until you deliver it.