DHT (dihydrotestosterone)
The hormone that drives pattern hair loss.
A derivative of testosterone produced by the enzyme 5-alpha reductase. In genetically susceptible follicles DHT shortens the growth phase and shrinks the follicle a little with each cycle. Follicles at the back and sides of the head are not sensitive to it, which is exactly why hair taken from there keeps growing once transplanted.
Related terms
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Anagen phase
The growing phase of the hair cycle.
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Crown (vertex)
The whorl at the top and back of the head.
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Donor area
The band of hair at the back and sides that supplies the grafts.
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Follicular unit
The natural grouping of one to four hairs that grow together.
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Graft
One follicular unit, moved from the donor area to the recipient area.
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Hairline design
Where the new hairline is drawn, and at what angle.
