FUT is the original follicular unit technique and, for the right patient, it remains the most productive. A narrow strip of skin — typically one to one and a half centimetres wide — is removed from the permanent donor zone at the back of the head. The wound is closed with a trichophytic closure that encourages hair to grow through the resulting line, and the strip goes to the dissection bench.
There, under stereo microscopes, technicians separate the strip into individual follicular units. This is the technique's central advantage: units are cut out under direct magnified vision, with the surrounding protective tissue intact, rather than punched blind through the skin. Transection rates are consistently low and the grafts tend to be robust.
FUT has fallen out of fashion because it leaves a line rather than dots, and because most patients want the option of cropping their hair short. But when a patient needs four or five thousand grafts, has good scalp laxity, and intends to keep their hair at a normal length, no other technique moves as much hair in a single day.