"I have seen men with better than 100% of their original density in the recipient area (>100 FUE/cm square). This was not done by me, but rather from an immoral doctor who told normal men they they needed hair transplants (for him to make money). He had a lot of charisma so he sold innocent young men hair. As this doctor was in Beverly Hills, I would see some of his patients and was able to measure higher than normal donor densities because he make them that way. I learned that more hair can always be added but good judgment would require a reasonable replacement density in the recipient area of a balding man of about 50% of the original recipient area density in a person with an average hair thickness. For fine haired people, that target might be higher, but more grafts means more donor site depletion. Dr. Erdogan and I have mutual respect for each other and I am sure that any discussion between the two of us would align. Possibly, what I was talking about in my bladingblog post was either less clearly defined or misunderstood. Maybe this writing clarifies where I am coming from.
William Rassman, M.D."
Earlier from Dr. Rassman's baldingblog :
"There is no limitation on the density of transplanted hairs, except on a per session basis. How close you can put the grafts together during surgery depend on the width of the grafts (not hair). Some grafts can be 1/16 to 1/8 of an inch wide.
"If you are a Norwood 3 and want the original donor hair density, then it may be possible with multiple surgeries."
"You must understand that hair transplant surgery involves moving hair from one location to another location. It does not create new hair. Let’s say that you got 35% of your original density in one session, then you want the same number of grafts transplanted again, assuming that the donor supply is as good, you can probably come close to doubling the 35%. Again, if you then wanted to do another 35% equivalent grafts, you will be getting close to 100% of the original density. There is actually some limits to this process, for example, what is the size of the donor area, the blood supply and the availability of grafts from the donor area. When grafts are placed very, very close together, we call this term dense packing"