TLDR Pulling 2 or fewer hairs is normal for all hair types, including Afro- and Asian-textured hair.
This study updated the hair-pull test guidelines to include individuals with Afro- and Asian-textured hair, involving 198 participants. It confirmed that pulling 2 or fewer hairs is considered normal across all hair textures, aligning with previous guidelines primarily based on Caucasian hair. The study found no significant impact of hair-care practices, such as washing or brushing, on the test results. Afro-textured hair showed more breakage due to its structural characteristics, but chemical treatments did not significantly alter the number of hairs removed. The study emphasized the need for consistent interpretation of the hair-pull test across different hair types.
16 citations
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June 2017 in “PLoS ONE” A 6-group hair classification is more reliable for drug testing than an 8-group system.
36 citations
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December 2016 in “Journal of The American Academy of Dermatology” The normal range for the hair pull test is 2 hairs or fewer, and washing or brushing hair before the test does not affect the results.
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