Setting Reference Values in Trichology

October 2015 in “ International Journal of Dermatology ”

Alfredo Rebora, Marcella Guarrera, Francesco Drago, Alfredo Rossi, Maria Caterina Fortuna, Francesco Domenico D’Ovidio, Paolo Chieco, Bianca Maria Piraccini, Michela Starace

androgenetic alopecia hair density hair diameter vertex occiput hair shedding AGA

TLDR Normal hair density and diameter ratios were established to help diagnose adult hair loss.

The study involved 60 Caucasian children aged 4-10 years and aimed to establish reference values for hair density and diameter ratios at the vertex (V) and occiput (O) to aid in diagnosing androgenetic alopecia (AGA) in adults. The results showed that the normal V/O ratio for hair density is between 0.73 and 1.41, and for hair diameter, it is between 0.80 and 1.24. Ratios below these values indicate a high probability (95%) of AGA. The research also determined that average hair shedding is 1-2 hairs per day. The conclusion was that V/O ratios less than 0.73 for density and less than 0.80 μm for diameter are indicative of AGA.

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