Olsen developed a scale for precisely describing the pattern of hair density in a patient with male pattern hair loss. This can aid in the initial assessment and to monitor the patient over time. The patient is from Duke University in Durham, North Carolina.
Scalp Region
Anatomic Location
frontal (F)
central half of frontal scalp, with the edge extending back to a coronal section that passes through the angle of the jaw (with the scalp is viewed from above)
temporal (T)
scalp flanking the sides of the frontal region
mid (M)
region between temporal/frontal and vertex regions
vertex (V)
circular posterior zone over occiput, with anterior edge at the top of the head just behind the ears (if viewed from above)
The frontal and temporal regions can be further subdivided into anterior (F1, T1) and posterior (F2, T2) halves.
The vertex can be subdivided into 3 zones (V1, V2, V3) with radii 33%, 66% and 100% of the maximum.
Hair Density in a Region
Points
100%
0
50%
1
25%
2
12%
3
6%
4
3%
5
total or near total loss
6
where:
• Each point is assigned for a halving the hair density. In theory intermediate points could be assigned from a constructed equation: points = 6.633 - (3.315 * LOG10(percent))
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