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This source reports that two noninvasive tests, the pull test and a modified wash test, can help diagnose and determine the severity of different types of hair loss in women by assessing hair shedding and characteristics, offering a simple and cost-effective evaluation method.

This chapter describes two simple, noninvasive methods — the pull test and modified wash test — which can diagnose and assess the severity of female hair loss, including conditions like telogen effluvium and androgenetic alopecia.

In this study, washing rhesus monkey hair with water or shampoo significantly reduced cortisol levels, suggesting potential underestimation of chronic stress hormone deposition in hair due to washing.

Hair chromium levels reflect nutritional status after standard washing.

This study of Danish women found no evidence linking hair cortisol concentration to hair dyeing status or the frequency of hair washing.