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Did you mean Terminal to Vellus Hair Ratio?

GlossaryTerminal to Vellus Hair Ratio

proportion of thick hairs to fine hairs on the scalp

The Terminal to Vellus Hair Ratio refers to the proportion of thick, pigmented hairs (terminal hairs) to fine, short, and lightly pigmented or non-pigmented hairs (vellus hairs) on the scalp or other parts of the body. This ratio is often used in the diagnosis and monitoring of hair loss conditions like androgenetic alopecia, where a decrease in the ratio indicates a shift from terminal to vellus hair, signifying hair thinning and miniaturization.

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Effects of Platelet-Rich Plasma on Hair Follicle Count and Hair Ratios in Androgenic Alopecia: Alone or Combined with Other Treatments

research Effects of platelet-rich plasma application on hair follicle count, telogen/anagen ratio, and miniaturized hair ratio in patients with androgenic alopecia: alone or in combination with other treatments

July 2025 in “Journal of Dermatological Treatment”

PRP improves hair growth in androgenic alopecia, especially when combined with minoxidil.

research The Effect of Plasma Rich in Growth Factors on Pattern Hair Loss: A Pilot Study

70 citations , February 2017 in “Dermatologic Surgery”

Treatment with plasma rich in growth factors improved hair density and thickness for hair loss patients.

research Characteristic findings by phototrichogram in southern Chinese women with Female pattern hair loss

10 citations , January 2019 in “Skin Research and Technology”

Southern Chinese women with female pattern hair loss have less, thinner hair and smaller hair follicles.

Efficacy of Intramuscular Injections of Biotin and Dexpanthenol in the Treatment of Diffuse Hair Loss: A Randomized, Double-Blind Controlled Study Comparing Two Brands

research Efficacy of intramuscular injections of biotin and dexpanthenol in the treatment of diffuse hair loss: A randomized, double‐blind controlled study comparing two brands

1 citations , July 2022 in “Dermatologic Therapy”

Both brands of biotin and dexpanthenol injections improved hair loss, with Bayer also increasing the ratio of thick to thin hairs.

research Efficacy and tolerability assessment of a polynucleotide‐based gel for improvement of pattern hair loss Running title: A polynucleotide‐based gel for improvement of pattern hair loss

October 2023 in “Research Square (Research Square)”

Polynucleotide gel injections help reduce hair loss and increase hair thickness in people with pattern hair loss, with few side effects.

research Follicular miniaturization in female pattern hair loss: clinicopathological correlations

100 citations , June 2006 in “British Journal of Dermatology”

Hair loss severity relates to increased miniaturization in female pattern hair loss.

research Occipital involvement in female pattern hair loss: histopathological evidences

20 citations , August 2009 in “Journal of The European Academy of Dermatology and Venereology”

Occipital scalp affects female hair loss; terminal/vellus ratio helps diagnose androgenetic alopecia.

research Hair Counts from Normal Scalp Biopsy in Taiwan

24 citations , 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.

research Mapping the hair density, thickness, and volume in normal and androgenetic alopecia subjects with the digital microscope

December 2022 in “JEADV Clinical Practice”

Hair density and thickness decrease in specific scalp areas in people with androgenetic alopecia.

research Dermoscopy in hair disorders

12 citations , January 2014 in “Menoufia Medical Journal”

Dermoscopy improves diagnosis of hair and scalp disorders and can help avoid unnecessary biopsies.

research Hair Follicle Miniaturization in a Woolly Hair Nevus

6 citations , February 2016 in “American Journal of Dermatopathology”

The boy with woolly hair nevus had thinner hair and abnormal hair follicles, which improved with treatment but worsened when treatment stopped.

research The reliability of horizontally sectioned scalp biopsies in the diagnosis of chronic diffuse telogen hair loss in women

137 citations , July 2004 in “Journal of The American Academy of Dermatology”

Horizontally sectioned scalp biopsies are more reliable for diagnosing hair loss in women when three samples are taken instead of one.

research Scalp Biopsy and Diagnosis of Common Hair Loss Problems

2 citations , July 2013 in “InTech eBooks”

Scalp biopsy helps tell apart permanent and temporary hair loss types and guides treatment.

research Concentrated Growth Factor from Autologous Platelet Promotes Hair Growth in Androgenetic Alopecia

1 citations , January 2019 in “Journal of Biomedical Science and Engineering”

CGF from platelets helps hair regrowth in people with androgenetic alopecia.

research Hair Loss Physiology and Transplantation Principles

January 2020

Hair loss is caused by hormonal changes that shorten hair growth phases and shrink hair follicles.

research Clinicopathological insights into the phenotypic variation of autosomal recessive hypotrichosis/wooly hair by c.736T>A LIPH mutation

September 2016 in “Journal of dermatological science”

The conclusion is that the variation in hair thinness in patients is mostly due to the amount of underdeveloped hairs, and treatments that thicken fine hairs might work for those with mild to severe conditions.

research Is TrichoScan a new diagnostic method for diffuse hair loss?

2 citations , January 2014 in “Turkish Journal of Medical Sciences”

TrichoScan effectively diagnoses different types of hair loss and is linked to low iron stores in patients.

research CLINICO-TRICHOSCOPIC EVALUATION OF HIRSUTISM TREATED WITH INTENSE PULSED LIGHT IN A TERTIARY CARE HOSPITAL IN EASTERN INDIA

August 2023 in “Asian journal of pharmaceutical and clinical research”

Intense Pulsed Light is an effective and safe hair removal method for people with excessive hair growth.

research Histopathologic prognostic factors for alopecia areata treated by intralesional corticosteroid

April 2016 in “Journal of The American Academy of Dermatology”

Certain scalp tissue features can predict how well alopecia areata responds to steroid injections.

research The histopathology of alopecia areata in vertical and horizontal sections

19 citations , December 2001 in “Dermatologic Therapy”

Horizontal scalp biopsy sections are better for diagnosing alopecia areata, showing fewer hair follicles and more miniaturized hairs.

research Clinical, trichoscopic, and histopathologic characteristics of patients with alopecia and hypothyroidism: An observational study

2 citations , May 2018 in “Journal of The American Academy of Dermatology”

Hypothyroidism patients with hair loss typically have thinning hair, smaller hair follicles, and normal hair shedding.

Telogen Effluvium: Acute and Chronic Hair Loss Conditions

research Telogen Effluvium

32 citations , October 2009 in “Dermatology”

Telogen effluvium is a hair loss condition with acute cases resolving quickly and chronic cases potentially lasting longer, sometimes requiring treatment.

Chronic Telogen Effluvium: Is It a Distinct Condition? A Systematic Review

research Understanding fibrosing alopecia in a pattern distribution: a retrospective study with histological challenges in the diagnosis of diffuse central alopecia

February 2025 in “Archives of Dermatological Research”

Fibrosing alopecia can be diagnosed without typical signs of lichen planopilaris.

research Efficacy of Stromal Vascular Fraction Versus Topical Minoxidil in Treatment of Androgenetic Alopecia: A Simple Randomized Study

January 2025 in “Journal of Carcinogenesis”

Stromal vascular fraction and topical minoxidil both improve hair growth similarly, but SVF offers a better treatment experience.

Efficacy of Platelet-Rich Plasma in Androgenetic Alopecia and Correlation Between Platelet Count in PRP With Clinical and Trichoscopic Improvement

research EFFICACY OF PLATELET-RICH PLASMA IN ANDROGENETIC ALOPECIA AND CORRELATION BETWEEN PLATELET COUNT IN PRP WITH CLINICAL AND TRICHOSCOPIC IMPROVEMENT.

March 2024 in “INTERNATIONAL JOURNAL OF SCIENTIFIC RESEARCH”

PRP can effectively treat hair loss, especially with optimal platelet count.