National origin of participants in the UK National External Quality Assessment Scheme toxoplasma serology subschemes
| Country | Toxoplasma IgG serology | Toxoplasma IgM serology |
| Austria | 4 | 4 |
| Belgium | 1 | 0 |
| Croatia | 2 | 2 |
| Cyprus | 4 | 3 |
| Denmark | 2 | 2 |
| Finland | 1 | 1 |
| France | 1 | 1 |
| Germany | 2 | 2 |
| Greece | 8 | 10 |
| Hong Kong | 1 | 2 |
| Iceland | 1 | 1 |
| Ireland | 5 | 6 |
| Israel | 4 | 1 |
| Italy | 52 | 47 |
| Malta | 0 | 1 |
| Morocco | 1 | 1 |
| Netherlands | 9 | 9 |
| Non-clinical laboratories (overseas) | 4 | 2 |
| Norway | 6 | 6 |
| Portugal | 39 | 45 |
| Saudi Arabia | 1 | 1 |
| Slovenia | 5 | 5 |
| South Africa | 5 | 5 |
| Spain | 1 | 1 |
| Sweden | 9 | 6 |
| Switzerland | 19 | 19 |
| Turkey | 1 | 1 |
| United Arab Emirates | 0 | 1 |
| UK | 140 | 41 |
| USA | 1 | 1 |
| Total no. of participants | 329 | 227 |