Donor hair density is one of the most important aspects of hair transplantation; the hair density around the sides and back (donor area) must be able to cope with the demands of the surface area (recipient area)
The donor hair density coupled with the average number of hairs per follicular unit (FU´s) can make you a good or bad hair transplant candidate. The approximate average hair density is 75 FUcm², but this can vary dependent on ethnicity and hair characteristics.
Regardless of the technique used, FUT or FUT donor hair density is an important factor; FUE is more reliant on donor hair density because the FU´s are removed over a wide surface area, lowering the donor area density. When planning your hair restoration it is important to have your donor hair density measured prior to making a decision. The density is calculated per cm², with the highest density found around the back of your head.
Almost whatever stage your hair loss is at the time of a hair transplant it should be assumed that has loss will progress and this needs to be taken into account. When treating a low Norwood Scale candidate if the donor hair density is low and hair loss progresses there maybe not enough hair to treat the area or give a balanced coverage, especially if a low hair line is fixed.
In turn, treating a high Norwood candidate the density needs to be calculated and then the hair transplant design planned to ensure a balanced coverage can be achieved. Donor hair density is a vital element that needs to be calculated when planning a hair transplant, coupled with the average number of hairs per follicular unit. Whenever you have a personal consultation with a Doctor ensure this is measured.