What densities do we aim for in hair transplantation?
One of the most important parts of the hair transplant surgery is determining how close to place or 'pack' the grafts. A patient with a large area of hair loss to fill (such as a Norwood VI) with limited donor supply may want to use 3000 grafts at a density of 30-35 follicular units per square cm. Another individual with limited hair loss in the frontal scalp may want to use 1000 plus hairs packed at a density of 35-45 follicular units per square cm
Different follicular unit densities for different patients and different areas of the scalp
The density that is chosen for each patient requires careful thought. A patient with course curly grey-white hair will require less grafts for than a patient with fine straight blonde hair. A density of 30-35 FU/cm2 might be chosen for the grey haired patient whereas a target of 40 FU/cm2 or more may be required for the patient with fine hair.
In addition, different areas of the scalp often require different densities to achieve a good result. The frontal hairline might require 40 FU/cm2 to 50 FU/cm2 depending on the patient.
It's extremely important to think about the density of recipient sites in hair transplant surgery There is not magic formula or recipe - and each patient's procedure needs to be carefully considered and planned.
Dr. Jeff Donovan is a Canadian and US board certified dermatologist specializing exclusively in hair loss. To schedule a consultation, please call the Vancouver office at 604.283.9299