In grades 2-5 baldness generally, a maximum density is what gives a natural appearance. There are standard calculations as to how many grafts need to be placed for a good density. According to me if the units are packed adequately with no further space for a graft in-between that’s when you get a good density.
In advanced grades of balding and when the area to be covered is large and the donor site only moderately adequate I tend to give a moderate hair density during hair transplant by placing the follicles slightly farther apart.
A careful and meticulous planning, judicious hair follicle harvest and discussion with the patient is the basic step to achieve lasting results in hair transplantation