Table 1: Histologic score in use for kidney allocation to SKT or DKT of “high-risk” donors.

Glomerular global sclerosis0: no glomeruli globally sclerosed
1: less than 20%
2: 20–50%
3: >50%

Arteries/arterioles wall thickness0: normal appearance
1: less than lumen diameter
2: equal/slightly higher than lumen diameter
3: higher than lumen diameter/severe lumen reduction

Tubular atrophy0: absent
1: less than 20% tubuli affected
2: 20–50%
3: >50%

Interstitial fibrosis0: absent
1: less than 20% parenchymal tissue substituted
2: 20–50% tissue
3: >50% tissue

The most severe lesion determines the score; the final score is the sum of 4 individual scores; with final score up to 4 (included) organs are allocated to solitary kidney transplantation (SKT); from 5 to 7 (included) organs are allocated to dual kidney transplantation (DKT); higher than 7 organs are discarded.