Confirmatory diagnosis of Loose anagen hair syndrome is made by?

Presence of Loose anagen hair >50% is used to confirm diagnosis of LAH. The presence of anagen hair devoid of its sheath and with 'floppy sock appearance' is a characteristic feature of loose anagen hair (LAH) on trichogram. The percentage of LAH in LAS is more than 50%. Loose anagen syndrome(LAS) is a hair disorder in which the hair is 'loose' and can be painlessly pulled from the scalp. Hair is not anchored into the scalp properly with no known cause. Affected patients have a 'bed head' appearance and hair that doesn't seem to grow.