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IRS Assessment scale according to Remmel (own modification) [5]
| Percentage of cells showing reaction (%) | Points | Intensity of reaction (I) | Points |
|---|---|---|---|
| Lack of the cells exhibiting reaction | 0 | No reaction | 0 |
| 1–25% of positive cells | 1 | Weak color reaction | 1 |
| 26–50% of positive cells | 2 | Moderate color reaction | 2 |
| 51–75% of positive cells | 3 | Intense color reaction | 3 |
| 76–100% of positive cells | 4 |
