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.

View this study on onlinelibrary.wiley.com →

Discuss this study in the Community →

Research cited in this study

2 / 2 results

research Reliability of the Pattern Hair Loss Classifications: A Comparison of the Basic and Specific and Norwood–Hamilton Classifications

16 citations, October 2012 in “The Journal of Dermatology”

The BASP classification is more reliable than the Norwood-Hamilton for classifying hair loss in men and women.

research Distinguishing Androgenetic Alopecia From Chronic Telogen Effluvium When Associated in the Same Patient

63 citations, October 2005 in “Archives of Dermatology”

Shorter, thinner hairs indicate AGA, while longer, thicker hairs suggest CTE; counting and measuring shed hairs helps diagnose hair loss type.

Related Community Posts Join

6 / 1000+ results

community Diffuse hair loss and scalp biopsies

in Research 692 upvotes 3 months ago

Scalp biopsies are crucial for diagnosing hair loss conditions like Diffuse Unpatterned Alopecia (DUPA) and retrograde hair loss, as treatments like finasteride and dutasteride may not be effective if other conditions are present. Combining PPAR-GAMMA agonists with retinoids could improve treatments for conditions like Lichen Planopilaris.

community Most Recent Interesting Hairloss Studies: 10% Minox vs 5% Minox / Radio Rrequency Treatment for AA / Topical Ketoconazole / PRP+Minox vs Minox vs PRP / Alopecia as a systemic disease

in Treatment 90 upvotes 4 years ago

Treatments for hair loss, such as topical minoxidil, platelet-rich plasma therapy with or without minoxidil, ketoconazole, non-abative radio frequency, natural products, finasteride and cortexolone 17 alpha propionate. The post evaluates the efficacy and safety of these treatments in various studies.

community 2020 Hair and Scalp Treatments: A Clinical Guide (in Depth 350 Page Guide)

in Treatment 63 upvotes 4 years ago

Treatments for hair loss, including topical immunotherapy, regenerative treatments, laser and light-based therapies, oral supplements, intralesional steroids, and new drugs like finasteride and minoxidil.

community HairClone developing cell replacement treatments for Hair Loss

6 upvotes 5 years ago

HairClone is developing cell replacement treatments to rejuvenate and generate hair follicles, and has launched a crowdfunding campaign. A user expressed skepticism about the need for crowdfunding.

community Taking Charge of Your Hair: The "Big 3 Stack" Explained for 2023

in Research/Science 129 upvotes 1 year ago

The "Big 3 Stack" for hair loss treatment, which includes Minoxidil for hair density improvement, Ketoconazole shampoo for enhancing hair volume and thickness, and Finasteride for blocking hair loss causing hormones. Microneedling can boost Minoxidil's effects.

community Let's be clear, does Finasteride stop MPB as long as it's taken?

in Finasteride/Dutasteride 170 upvotes 7 months ago

Finasteride is believed to slow down hair loss significantly, but may not completely stop it for everyone. Effectiveness and duration vary by individual, with some users experiencing positive results for over 10 years, while others see less benefit.

Related Research

1 / 1 results

research Significant Relationship Between Temporal Hair Loss and Other Scalp Areas in Female Pattern Hair Loss

5 citations, January 2020 in “Journal of Dermatology”

Temporal hair loss relates to overall scalp hair loss in women.