Alopecia other diagnostic studies

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

There are tests that can be completed outside of the laboratory that will help to confirm the diagnosis.

Pull test: Firm pull on 20-40 hairs should yield fallout of no more than 1 in 10 hairs
- Increased # telogen hairs with depigmented proximal bulb: Telogen effluvium
- Increased # hairs with no bulb: Breakage (hair fragility due to exogenous injury)
- Anagen hairs with pigmented root: Likely excessive force
Follicular units: Number of hairs produced per follicular orifice
- Threes = normal for ages 20-40
- Twos = normal for ages 40-60
- Ones = normal for ages > 60
- Voids = follicular orifices without hairs suggests advanced androgenetic alopecia if no scarring