The method of collecting shed hair Some patients with unknown diagnosis need to collect shed hair for examination as follows: Before coming to the clinic, you need to not wash your hair for 3 days, comb your hair carefully the morning before the clinic (with a table then), collect all the shed hair, arrange them in order, with the white end facing upwards, and stick them onto a piece of white paper with transparent tape (the end with the white end should be exposed about 1 cm ), you can refer to the attached picture. Bring it to the clinic for laboratory testing, about 50-100 hairs are needed. If you lose less hair when combing your hair, you can immediately wash your hair and collect the hair that falls out when you wash your hair together, taking care to always try to collect all the hair that falls out. If you can’t pick up the hair, you can keep track of the number, and pay attention to whether the hair is thin and short or about the same as normal. If you can’t do the above, you can collect all the hair that falls out during a certain period of time, such as a certain combing, a certain washing or a certain day, about 50-100 hairs are needed.