Do vellus hairs need to be less than 1 mm in length?

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Last updated: September 30, 2026 • View editorial policy

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Ne, velusne dlake NE moraju biti manje od 1 mm

Velusne dlake se definišu prema prečniku, a ne prema dužini. Prema vodičima iz 2019. godine, velusne dlake su definisane kao dlake sa prečnikom manjim od 0.03 mm i bez pripojenog mišića arrector pili 1.

Ključna razlika: Prečnik vs. Dužina

Postoji fundamentalna razlika između načina na koji se velusne dlake karakterišu:

Dijagnostički kriterijum - Prečnik:

  • Velusne dlake: ≤0.03 mm u prečniku 1
  • Terminalne dlake: >0.03 mm u prečniku
  • Ovo je standardna definicija koja se koristi u histopatološkoj analizi biopsija skalpa

Dužina velusnih dlaka:

Istraživanja pokazuju da velusne dlake mogu imati različite dužine:

  • Stopa rasta: 0.03-0.16 mm/dan u zavisnosti od anatomske lokacije 2
  • Maksimalna dužina se smanjuje sa godinama 2
  • Dužina varira prema lokaciji na telu (čelo, leđa, grudi)

Klinička primena

Kada se procenjuje gubitak kose kod žena (FPHL):

Biopsija skalpa koristi odnos terminalnih prema velusnim dlakama:

  • Normalno: 7:1 odnos 1
  • FPHL: <3:1 odnos se smatra dijagnostičkim 1
  • Dijagnoza se bazira na prečniku dlake, ne na dužini

Dermoskopija/Trihoskopija može identifikovati:

  • Prisustvo više od 6 velusnih dlaka po polju (20x uvećanje) u frontalnoj oblasti sugeriše FPHL 3
  • Varijabilnost u prečniku dlaka tokom procesa minijaturizacije 1

Važna napomena

Novija istraživanja predlažu modifikovane klasifikacije koje uključuju "intermedijarne" dlake (prečnik 0.03-0.06 mm), što poboljšava dijagnostičku senzitivnost na 96% 4. Međutim, standardna definicija velusnih dlaka ostaje bazirana na prečniku od ≤0.03 mm, bez obzira na dužinu.

References

3
Research

Vellus hairs in the frontal scalp in early female pattern hair loss.

International journal of trichology, 2013

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