Norwood scale
The seven-stage classification of male pattern hair loss.
The standard seven-stage scale describing how male pattern hair loss progresses, from a slight temple recession at stage 2 to a horseshoe of hair at stage 7. Clinics use it as shorthand because it predicts roughly how many grafts a case will need.
Related terms
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Anagen phase
The growing phase of the hair cycle.
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Crown (vertex)
The whorl at the top and back of the head.
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DHT (dihydrotestosterone)
The hormone that drives pattern hair loss.
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Donor area
The band of hair at the back and sides that supplies the grafts.
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Follicular unit
The natural grouping of one to four hairs that grow together.
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Graft
One follicular unit, moved from the donor area to the recipient area.
