P154 Revised basic and specific (BASP) classification for pattern hair loss

Background: In 2007, Lee et al. introduced BASP classification for pattern hair loss (PHL), which was more comprehensive and applicable regardless of race or gender. However, BASP has its limitation in that the classification of frontal type is relatively rough and it cannot ascertain a specific hair loss pattern when the hair loss is associated in the temporal and occipital area. Objectives: To propose the revised BASP classification and to compare its utility and value for practical use with existing one. Methods: The subjects were 138 PHL patients who had visited our department since April 2015 to March 2016. In the revised BASP classification, the frontal type was subdivided into 5 stages from 3 stages, leaving basic type classification as same as the old one. In addition, the information whether temporal or occipital scalp was involved was also recorded. The clinical accuracy and ease of use were evaluated. Results: 12 subjects were excluded for being more suitable for chronic telogen effluvium. Temporal or occipital involvement was observed in 14 patients (11.11%). The clinical accuracy of the final type was 82.5% in the existing BASP classification and 71.4% of the revised one. Ease of use was 70.2% and 72.1% in the existing BASP classification and 48.9% and 52.2% in the revised one, respectively. Conclusion: The revised BASP classification which has supplemented the limitation of existing classification could be one of the possible alternative options in the classification of PHL.