During your initial consultation, we determine how many grafts you will need based on the below Norwood scale. If your hair pattern is closest to a class 1, 2, 2A, 3, or 3A, then you will be considered for a small hair transplant. If your hair pattern resembles a pattern between class 3A and 3 vertex, you will be considered for a medium hair transplant. If you hair pattern is class 3 vertex or 4, you will be considered for a large hair transplant. Hair-loss patterns that are class 4, 4A, 5, 5A, 6 or 7 will be considered for an extra-large hair transplant. Hair loss patterns Class 5 and above (5A, 6, or 7) will need multiple procedures. The amount of hair that can be harvested is dependent on your donor site. On the day of the procedure, when we shave your donor site area, we take a densitometer to determine your hair density. It is recommended that we not take more than 10 to 15% of the hairs in the donor site to prevent bald spots in the donor area.