Hi
I have done a bit of research and would like to share some findings with this community.
I note that people are focused mainly on the number of grafts when discussing HT. But if we agree that coverage/density are the most important issues then we realise that :
It is the number of transplanted hairs that actually matters rather than the number of grafts.
According to one source (Dr Rassman) the number of FU is pretty much the same per cm2 across patients- about 100.
What varies is the hair diameter (very important for the final visual result) and the number of hairs per FU. A patient who averages 2.3 hairs per FU will get a better result, for the same number of grafts, as someone averaging 1.8- ie for 1,000 grafts : 2,300 hairs in the first case and 1,800 in the other- quite a difference.
Also there is the issue of hair/scalp color and contrast : dark hair and white skin give the surgeon more of a challenge than blonde hair/fiar skin.
Overall, we then would need to ask patients/doctors about the number of hairs actually transplanted, not only the number of grafts. This incidentally raises the question of the subdivision of naturally occuring grafts by unethical doctors, but that is another topic...