In order to classify the severity of hair loss, doctors created a series of charts categorizing various stages of hair loss. The charts are very useful when describing your hair loss to someone or as a yard stick to measure your own hair loss progression or regrowth. The charts are only relevant to Male and Female Pattern hair loss since the hair loss occurs in a predictable pattern.
The most commonly used chart for men is the one developed by Dr Hamilton and then later modified by Dr. O’tar Norwood called the Norwood-Hamilton scale.
Women who suffer from Androgenic Alopecia have a pattern of hair loss called Female Pattern Loss. This loss does not occur in the same pattern as men but appears as a diffuse thinning throughout the scalp. There is a chart designed to classify Female Pattern loss called the Ludwig Scale. There are however always exceptions and in some cases men may suffer from a diffuse type thinning and women may experience a similar hair loss pattern to men.