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RO Density is what is placed; coverage is what is seen. They are not the same measurement and they do not move together. Coverage depends on how much light each hair blocks — its thickness, its curl, and how close its colour is to the scalp beneath. Coarse dark hair on pale skin can look full at a density that would look sparse in fine straight hair, so the graft number that satisfies one head is wrong for another.
| Factor | Effect on apparent fullness |
|---|---|
| Hair calibre | The strongest single factor; thick shafts block more scalp |
| Curl or wave | Lifts hair off the scalp and shadows it |
| Hair-to-skin contrast | Low contrast hides thinness; high contrast exposes it |
| Hairs per follicular unit | Two units of three hairs cover more than three units of two |
Planning distributes a fixed budget, it does not set a target. The donor holds a finite number of units for a lifetime, and every square centimetre filled now is one that cannot be filled later. Density is therefore assigned region by region — heaviest where the face is framed, lighter through the mid-scalp, most restrained in the crown — against the pattern the person is expected to reach, not the one they have.
The first procedure is the one that spends the most. Leaving room for a second pass, in the same area or a different one, is a design decision made before the first graft is placed. It cannot be added afterwards.
Related terms
- High density hair transplant
- Graft vs hair count
- Safe donor area
- Crown whorl design
- Hair miniaturization
For how a graft number is arrived at for a given pattern, see how many grafts you need. For an estimate based on your own pattern, see the graft calculator.
