Many people can see and know where their donor starts if clearly defined.
For others, the generally accepted standard is to draw a line connecting the tips of both ears. That is a pretty safe donor commencement line in most cases, and again is an approximate guide.
When estimating the balding area, and there is no hairline, 90% of men will mark in a reasonable hairline. Others will draw a hailine close to their eyebrows. That can’t be helped, but in cases of doubt , the BDR can be a range e.g BDR 0.5-0.7 , but I expect that will rarely be an issue.
As for hair911, your hair is diffuse. Thats all I know about you so as an example, I will fill in the rest. I will assume you are diffusely thinning at the front half only.
So HAIR911 may be “BDR 0.5 sd medium dd medium cc medium pe diffuse front half”.
I immediately have a mental picture of the relative size of your balding area compared to donor, an approximate idea of your SHAFT DIAMETER, DONOR DENSITY COLOR CONTRAST and the PRE EXISTING HAIR in the area in question .
When men are concerned enough about hair loss to visit forums and post, they usually can tell you if they have fine or coarse hair, a thin or thick donor, white skin and black hair or other, and if the pre existing hair is zero, diffuse or medium.
The Norwood scale is a rough guide. The BDR tries to be a QUANTITATIVE measure, but it is an approximate guide.
The othe parameters of sd, dd, cc and pe are QUALITATIVE. It is to give us a rough idea of what is the patients situation. The other thing of course is age.
If johnp is a “BDR 1” , we can roughly visualise his head . If he fills in SHAFT DIAMETER(SD) DONOR DENSITY(DD) COLOR CONTRAST(CC) PRE EXISTING HAIR and age, we will have a much clearer picture.
It won’t be a mug shot, but at least we won’t think he looks like michael, when infact he was much closer to Bobman pre op.
Dr Ray Woods