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measuring hair loss at men: the Hamilton - Norwood scale


Brief overview

The extent and pattern of male pattern baldness is often classified using a Hamilton-Norwood scale. Originally developed by Dr James Hamilton in the 1950's the pattern baldness classification system was modified to its current form by Dr O'Tar Norwood in the 1970's.

Representation
The higher the number, the more advanced the loss. The rate at which men lose hair is very independent. There are men that lose very rapidly in their 20's up to a NW3 or NW4 and stay at that point for the rest of their lives. Other men can have no detectable amount of hair loss until they are in their 50's, only to advance to a NW6 or NW7 in just a few short years.
Typically, if the individual begins to thin early in life there is a very good chance that he is destined for a great deal of hair loss. One very important indicator that most men can study to possibly help determine how far their hair loss will advance is their family history, especially any older males of the subject's family. However, the family history is merely a guide. Put it this way, if at least some people in your family have a good degree of hair loss and you are noticing signs at a young age then you may want to prepare yourself for more.
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The scale
There are seven distinct stages of hair loss identified in the Hamilton-Norwood scale, Norwood I being a normal head of hair with no visible hair loss, Norwood II showing the hair receding in a wedge-shaped pattern. Norwood III shows the same receding pattern as Norwood II, except the hairline has receded deeper into the frontal area and the temporal area. Type IV on the Hamilton-Norwood scale indicates a hairline that has receded more dramatically in the frontal region and temporal area.
The letters A and V are given to specify the direction of the pattern:
a stands for Anterior (clockwise);
v stands for Vertex (anti-clockwise)

Additionally, there is a balding area at the very top center of the head, but there is a bridge of hair remaining between that region and the front.
Type V on the v scale shows that very same bridge between the frontal region and the top center, also called the vertex, beginning to thin.
Type VI on the scale indicates that the bridge between the frontal region and the vertex has disappeared.
Finally, Type VII shows hair receding all the way back to the base of the head and the sides just above the ears.

All Hamilton-Norwood patterns and/or stages are determined genetically.
Below you find some of the most known patterns along with the full map.
Click on the icon to enlarge the Norwood scale image.
As reference, on this page you can consult the Ludwig scale, for measuring the severity of alopecia at women.