home run hair is hair that has to the potential to yield an illusion of full coverage. this is possible for almost any degree of hair loss loss when you have home run hair.
you are correct. you will never have the density you were born with. this simply is not possible unless you have a more limited degree of hair loss. for instance, if you are a class 3 or less, you probably can re-create the density you were born with, but you will have less hair in the back. once you exceed a class 3, it is not possible to achieve the density you began with without over borrowing from the donor region.
consider that the frontal area originally had 80 to 100 follicular units per square centimeter prior to the onset of hair loss. the surface area in the entire frontal area ranges from 50 to 90 sq. centimeters generally depending on the size of the head and the location of the desired hair line. The the average donor area will yield 7000 grafts or follicular units by strip with a range from 5000 to 9000. Adding FIT or follicular unit extraction to this may increase the yield to 9000 or 12000 grafts. follicular unit extraction alone may yield the same, more, or less. it is too early to say. you can do the math though. once your loss exceeds the frontal 1/3rd, you do not have the donor capacity to match the original density. of course, you do not need the original density to have the illusion of fullness. if you have better hair characteristics, namely diameter, you will achieve this goal with fewer grafts. if you have poor characteristics, especially fine hair, you may need more grafts than your donor area can supply.











