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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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      An Overview of Female Pattern Hair Loss

      research An Overview of Female Pattern Hair Loss

      2 citations, June 2011 in “Expert Review of Dermatology”
      Female pattern hair loss involves thinning hair on crown and frontal scalp, diagnosed by hair ratio, and treated with minoxidil, antiandrogens, or hair transplantation.
      Hair Counts from Normal Scalp Biopsy in Taiwan

      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.
      Dermoscopy in Hair Disorders

      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.

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