Geometric Classification of Scalp Hair for Valid Drug Testing, More Reliable Than Hair Curl Groups

    June 2017 in “ PLoS ONE ”
    Kwezikazi Mkentane, Jennifer C. Van Wyk, N. Sishi, Freedom Gumedze, Malebogo Ngoepe, Lester M. Davids, Nonhlanhla P. Khumalo
    TLDR A 6-group hair classification is more reliable for drug testing than an 8-group system.
    The study evaluated the reliability of a geometric classification system for scalp hair, finding that a 6-group method was more reliable than the previously used 8 hair curl groups. Despite the study's small size, it highlighted the need for a reliable and objective classification of human hair curl, especially as hair is increasingly used as a substrate for testing treatment compliance in medicine. The study suggested that a digital classification system could further reduce operator error.
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