TLDR Trichoscopy and pathological examination both have unique benefits and cannot completely replace each other in evaluating hair.
The study "Comparison Between Trichoscopic and Histopathological Evaluations of Hair Parameters" conducted a cross-sectional study on 30 volunteers to compare the efficacy of trichoscopy and pathologic examination in hair counting. The study found that hair densities varied across different scalp regions, with the highest density in the vertex region. The occipital region had a hair density of 163.07±28.17/cm2, a vellus ratio of 6.60±3.95%, and a hair shaft diameter of 74.52±8.02μm. Some volunteers showed pathologic features of androgenetic alopecia (AGA) in occipital areas, suggesting that AGA can affect this area even in early stages. The study concluded that both trichoscopy and pathological examination have their advantages and disadvantages, and the data obtained from these two methods are different to some extent, which cannot be substituted entirely for each other.
Cited in this study
9 / 9 results
3 citations
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November 2021 in “Frontiers in Medicine” 1 citations
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March 2021 in “Frontiers in Medicine” 
31 citations
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February 2020 in “BioMed Research International” Thai people's hair density decreases with age and varies by scalp area, but hair thickness stays the same regardless of age or scalp area.
10 citations
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July 2019 in “Skin Research and Technology” Southern Chinese women with female pattern hair loss have less, thinner hair and smaller hair follicles.
30 citations
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December 2017 in “Clinical, Cosmetic and Investigational Dermatology” Parietal scalp area has lower hair density and smaller hair diameter in women with hair loss.
24 citations
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September 2012 in “Dermatologic Surgery” The conclusion is that normal scalp hair counts for Taiwanese people were established, showing age-related differences but not sex or scalp location differences.
40 citations
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July 2009 in “Journal of Cutaneous Pathology” AGA patients have fewer hairs and smaller follicles; T:V ratio above 4:1 may indicate AGA.
129 citations
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June 1999 in “Archives of Dermatology” African Americans have less hair density than whites.
309 citations
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May 1993 in “Journal of The American Academy of Dermatology” Horizontal scalp biopsy sections effectively diagnose and predict MPAA, with follicular density and inflammation impacting hair regrowth.
December 2022 in “Skin Pharmacology and Physiology” Special scalp and hair examination techniques can identify hair problems.
22 citations
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January 2017 in “Indian Dermatology Online Journal” Body hair transplants can treat baldness but differ from scalp hair and need more research on long-term results and side effects.
6 citations
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April 2015 in “Clinical and Experimental Dermatology” Hair density and thickness decrease in all scalp areas for East Asians with AGA.
24 citations
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September 2012 in “Dermatologic Surgery” The conclusion is that normal scalp hair counts for Taiwanese people were established, showing age-related differences but not sex or scalp location differences.
22 citations
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May 2002 in “Skin Research and Technology” CE-PTG detects early hair follicle issues in balding areas, helping measure male hair loss.
