What the Norwood scale can and cannot tell you
The Norwood classification describes the shape of male pattern loss in seven stages, from a maturing hairline to extensive loss with only a horseshoe of permanent hair remaining. It is a communication tool: it lets you and a clinic on the other side of a continent talk about the same picture. What it does not capture is speed, donor density, hair calibre or the diffuse thinning that often sits behind an apparently intact hairline. Two men at the same stage can need very different plans, and one of them may not be a candidate for surgery at all yet.