Hair Loss Types

How Androgenetic Alopecia is Classified?

Classification of Androgenetic Alopecia in Men

For the classification of Androgenetic Alopecia in men, Norwood scale is used that divides the Androgenetic Alopecia into seven types as follows:

  • Type I – Minimal to no hairline recession.
  • Type II – Triangular, normally symmetrical, region of frontotemporal hairline recession.
  • Type IIA: hairline is anterior to the coronal plane 2 cm anterior to the external auditory meatus.
  • Type III – Deep, symmetrical recession at the temples which are exposed or very less covered by hair.
  • Type IIIA: The hairline has receded back to a point between the limit of Type IIA and the level of the external auditory meatus.
  • Type IV – Worsening frontotemporal recession that has minimal to no hair on the vertex.
  • Type IVA: The hairline has receded beyond the external auditory meatus but has not reached the vertex.
  • Type V – The hair loss seen in the frontotemporal and vertex areas are still separate, but they are becoming less distinct from each other.
  • Type VA: The area of denudation includes the vertex. Hair loss more severe than Type VA cannot be distinguished from Types VI or VII.
  • Type VI – The frontotemporal and vertex hair loss areas which are not combined, with only thin patches of hair remaining between the two.
  • Type VII – Horseshoe pattern of hair remains only, wrapping around the back and sides of the scalp. The rest of the head is bald.

Classification of Androgenetic Alopecia in Women

In women, androgenetic alopecia is classified according to the Ludwig Scale which separates female pattern baldness (androgenetic alopecia) into 1 of 3 different stages. This scale classifies the female pattern hair loss according to the severity that helps both patients and physicians in the diagnosis and treatment of this condition as follows:

  • Type I: In this stage, hair loss is said to be mild and hair loss at this stage is sometimes not noticeable as the frontal hairline remains comparatively unaffected. Hair loss in this stage occurs on the top and front of the scalp.
  • Type II: In this stage hair loss is moderate and women can notice thinning, shedding and decrease in volume of hairs and a center part which widens over time continuously. Based on the severity, a hair transplant process can be the best option for women who are classified under Type II.
  • Type III: In this stage, hairs are so thin thus it has difficulty in camouflaging the scalp which makes it visible to the naked eye.

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