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O’Tar Norwood at DHI Athens clinic

The need of classifying the progression of hair loss and alopecia is not only obvious, but also decisive for the communication between specialists. Most importantly, depending on the stage of alopecia that Norwood-Hamilton Scale of Male Pattern Baldness 23 The Anatomy of Hair Follicle the patient is in, classification systems serve as a foundation, enabling doctors to evaluate the results of several treatments and to draw scientific conclusions.


Internationally, there are two very useful classifications of male pattern baldness applied. The mere fact that many patients do not fit into any specific classification category per se, does not cancel their usefulness and necessity.

DHI Medical Group applies the Norwood classification in its data processing program. The older Hamilton classification has not lost its value; however, it causes many difficulties in cases of hair transplantation, in candidate selection, and in pattern designing.

Alopecia classification is related to the aesthetic data of the person at the specific time his/her problem is examined, and not to the future evolution of the hair loss, which has to be clinically tested from an experienced doctor. This procedure is called “prognosis” and is included in the diagnosis of Alopecia.

Norwood class

In class 3, there is definitely a sparseness or absence of hair in the vertex area

In classes 3,4,5, there is a band of moderately dense hair that joins the front temporal area with the already empty vertex area

In class 6, the bridge of hair that crossed the crown in the previous types has now gone.