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Norwood Hamilton Hair Loss Scale
The Norwood Hamilton scale is one used extensively to identify the type of hair loss that is occurring. It helps to identify how much the hair loss has progressed, and the likely future of the hair loss. It is essential that accurate identification of the state of the hair as this will decide what particular treatment is possible and helpful. Below is a diagram illustrating the various different stages of baldness.
Class I
This is normally referred to as a juvenile hairline, it is not considered to be hair loss. The hair line of someone who is young will tend to be at the upper brow crease
Class II
This stage shows how the hair goes to a mature hairline once in adulthood. It tends to sit about 1.5 cm further above the upper brow crease. This is not considered to be balding
Class III
This is considered to be the first stage of the hair loss in males. Its main feature is that the receding at the temples is receding.
Class III Vertex
This is the same as Class III with the addition of hair loss occurring in the crown (also known as the vertex)
Class IV
This is an enlargement of what was occurring in Class III Vertex with both the temporal region receding more and the vertex region getting larger. In this stage there is still a band of hair separating the two balding regions.
Class V
Both areas of balding are getting larger and they start to merge together
Class VI
In this stage further balding occurs from Class V, the bridge area between the two balding zones disappears
Class VII
Hair loss is almost complete with only a small growth of hair around the ears and back of the head
Class A variations
These patterns of baldness does not happen usually, but the reason it is put as a class is because it makes the balding look extensive even when the hair loss is quite minimal.