Score | Proportion |
Score 0 | No cell stained. |
Score 1+ | >0 to 1/100 of cells stained. |
Score 2+ | >1/100 to 1/10 of cells stained. |
Score 3+ | >1/10 to 1/3 of cells stained. |
Score 4+ | >1/3 to 2/3 of cells stained. |
Score 5+ | >2/3 to 1/1 of cells stained. |