The average donor site has between 110-140 hairs per cm². A donor site with less than 90 hairs per cm² would be thought of as un-acceptable for an AHI procedure. Luckily, over 70% of clients we consult are candidates for the procedure. During the initial consultation we will count the exact number of hairs available in the donor site with the following method which is: The number of hairs per cm² (in the donor area) which is visible by using a digi-scope or hair scanner by the cm² area of the donor site. This figure should then be divided by 30% to 35% in order to know exactly the number of hairs we are able to extract and place in your thinning zone now and through the course of your life time.