Anti-tissue transglutaminase assays used by different laboratories with their corresponding upper limit of normal values
| Anti-tTG value (IU/mL) | Types of assays used for anti-tTG titre testing | |||
| Phadia | Elisa | Multiplex | Bioflash | |
| 4 | – | 6 | – | – |
| 5 | 2 | 3 | – | – |
| 7 | 11 | 2 | – | – |
| 8 | 1 | 1 | – | – |
| 9 | – | 1 | – | – |
| 10 | 26 | 14 | – | – |
| 13 | 1 | – | – | – |
| 15 | 1 | 2 | 3 | – |
| 20 | 0 | 2 | 0 | 3 |
| 30 | 0 | 2 | 0 | 2 |
| 42 | 33 | 3 | 5 | |
| Total number of laboratories using each assay | ||||