Hair Diameter Evaluation in Different Regions of the Safe Donor Area in Asian Populations

April 2017 in “ International Journal of Dermatology ”

Jae H. Park, Jae M. Park, Na R. Kim, Kotchamol Manonukul

hair diameter safe donor area non-alopecic zones eyebrow correction eyelash correction female hairline correction male pattern hair loss female pattern hair loss hair transplant surgery donor region hair thickness donor area hair transplant hair restoration

TLDR Different areas of the scalp have varying hair thickness, useful for different types of hair transplant needs.

In a 2017 study, researchers measured hair diameter in different regions of the safe donor area in 38 non-alopecic Korean subjects (19 males and 19 females). They found significant differences in hair diameter across seven zones, with hair becoming thinner from zone 3 to zone 7. The study concluded that zones 4 to 7 are better for surgeries requiring thinner hair, such as eyebrow, eyelash, and female hairline correction, while zones 1 to 3 are suitable for surgeries needing thicker hair, like male and female pattern hair loss. This information is useful for planning hair transplant surgery and selecting the best donor region.

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