Advanced Scalp Measurement Using a Phototrichogram With a Protractor and Tapeline

July 2016 in “ Dermatologic Surgery ”

Haerim Chung, Moo-Jin Jun, Won‐Soo Lee

phototrichogram BASP classification hair diameters alopecia glabella intraclass correlation coefficients dermatologists

TLDR The document concludes that using a phototrichogram with a protractor and tapeline is a reliable and noninvasive way to measure hair loss.

The document from 2016 describes a noninvasive and accurate method for evaluating hair loss using a phototrichogram with a protractor and tapeline, avoiding the need for permanent tattooing. The technique uses the glabella as a reference point and defines four additional points to assess different hairlines according to the BASP classification. It involves taking photographs at precise angles and distances, with hair diameters measured three times from magnified images. The method's reliability was confirmed by two dermatologists with intraclass correlation coefficients indicating excellent agreement (ICC >0.81), suggesting that this technique is reproducible and easy to perform for consistent hair measurement in alopecia studies.

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