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RO DUPA is the diagnosis that removes the donor area. In ordinary pattern loss the back and sides are spared, which is what makes surgery possible. In diffuse unpatterned alopecia the thinning extends across the whole scalp, the occiput included — so the region a transplant would harvest from is itself involved.
It is separated from its patterned counterpart by looking at two places, not one. Comparing the vertex against the occiput under magnification shows whether miniaturization is confined to the top or present at both. Where donor follicles are themselves miniaturizing, harvesting can worsen visible thinning at the back, and the moved follicles may continue to shrink afterwards (Xu et al., Frontiers in Medicine, 2026).
| Patterned diffuse loss | DUPA | |
|---|---|---|
| Top of scalp | Thinning | Thinning |
| Back and sides | Spared and stable | Involved |
| Donor for surgery | Available | Not reliable |
It is missed when only the top is examined. A patient presenting with a thin crown gets attention paid to the crown; the occiput looks dense to the naked eye and is passed over. Magnified assessment of the donor is what catches it, and it is the single check that most often changes a surgical plan.
A DUPA diagnosis is not the end of treatment. Medical management and objective monitoring of donor stability come first; surgery is reconsidered only if that stability can be demonstrated.
Related terms
For how donor capacity is assessed before anything is planned, see the donor area guide. For whether surgery is appropriate at all, see should I get a hair transplant.
