Hair Test Preparation North

Why Preparation Matters More Than You Think Sending a hair sample to a laboratory is not the same as mailing a form. The way your hair looks, feels, and even smells on the day of collection can influence the results. Laboratories look for traces of substances that have been incorporated into the hair shaft over time. They also check for external contamination that could muddy the reading. That is why preparation is not just a cosmetic step. It is a practical one that can af