Abstract：
BACKGROUND:The hair pull test lacks validation and has unclear pretest guidelines. OBJECTIVE:We sought to quantify normal hair pull test values and elucidate the effect of pretest hair washing and brushing. The impact of hair texture and lifestyle was also examined. METHODS:Participants (n = 181) completed a questionnaire recording demographics, medications, and hair health/history. A single hair pull test (scalp vertex) was performed. RESULTS:The mean number of hairs removed per pull was 0.44 (SD 0.75). There was no significant difference in the mean number of hairs removed regardless of when participants washed (P = .20) or brushed (P = .25) their hair. Hair pull test values were similar between Caucasian-, Asian-, and Afro-textured hair. There was no significant difference in hair pull values between participants taking medications affecting hair loss and participants not taking these medications (P = .33). Tight hairstyles did not influence hair pull test values. LIMITATIONS:Participant hair washing and brushing could not be controlled during the study, but this information was documented and analyzed. CONCLUSION:Normal values for the hair pull test should be reduced to 2 hairs or fewer (97.2% of participants). The current 5-day restriction on pretest hair washing can be reduced and brushing be made permissible.
journal_name
J Am Acad Dermatoljournal_title
Journal of the American Academy of Dermatologyauthors
McDonald KA,Shelley AJ,Colantonio S,Beecker Jdoi
10.1016/j.jaad.2016.10.002subject
Has Abstractpub_date
2017-03-01 00:00:00pages
472-477issue
3eissn
0190-9622issn
1097-6787pii
S0190-9622(16)30892-1journal_volume
76pub_type
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journal_title：Journal of the American Academy of Dermatology
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更新日期：2018-07-01 00:00:00
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