The methods of evaluation for oestrogen receptors used by UK NEQAS-ICC participants
| Threshold value | Frequency (No of labs) | % |
|---|---|---|
| 10% or more of tumour nuclei demonstrated15–19 | 106 | 50.0 |
| Histo (H) score20 22 23 | 17 | 8.1 |
| 20% or 25% and more of tumour nuclei demonstrated | 13 | 6.1 |
| 5% or more of tumour nuclei demonstrated | 10 | 4.7 |
| Quick score12 13 22 | 6 | 2.8 |
| 1% or more of tumour nuclei demonstrated6 8 21 | 3 | 1.4 |
| Category score13 22 | 2 | 0.9 |
| 50% or more of tumour nuclei demonstrated | 2 | 0.9 |
| Values known but each account for less than 0.9% of total | 8 | 3.8 |
| Unknown (information not provided by participant) | 45 | 21.2 |
| Total | 212 | 100 |