Table 2.
Visual versus automated detected titres of antinuclear antibodies by indirect immunofluorescence. Crosstabulation of antinuclear antibodies (ANA) titres by indirect immunofluorescence (IIF) for 89 serum samples that revealed a positive result by visual interpretation of the ANA-IIF-assay 2; concordant results are shown in bold (NEG: negative; AMB: ambiguous).
| Visual interpretation (gold standard) | Automated interpretation, n | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| NEG | AMB | 1 : 80 | 1 : 160 | 1 : 320 | 1 : 640 | 1 : 1280 | 1 : 2560 | 1 : 5120 | 1 : 10240 | 1 : 20480 | Total | |
| 1 : 80 | 1 | 15 | 16 | 1 | 33 | |||||||
| 1 : 160 | 2 | 2 | 10 | 1 | 15 | |||||||
| 1 : 320 | 1 | 1 | 1 | 6 | 9 | |||||||
| 1 : 640 | 3 | 1 | 1 | 1 | 5 | 11 | ||||||
| 1 : 1280 | 1 | 6 | 1 | 8 | ||||||||
| 1 : 2560 | 7 | 7 | ||||||||||
| 1 : 5120 | 1 | 2 | 3 | |||||||||
| 1 : 10240 | 1 | 1 | ||||||||||
| 1 : 20480 | 1 | 1 | 2 | |||||||||
|
| ||||||||||||
| Total | 1 | 21 | 20 | 13 | 9 | 5 | 6 | 9 | 2 | 2 | 1 | 89 |