PPV for differing cut off levels for TTG
| Number of Patients | ||||
|---|---|---|---|---|
| TTG cut off U/ml | x ULN | Coeliac disease | Not Coeliac Disease | PPV (%) |
| > 15 | 1 | 152 | 60 | 71.7 |
| > 30 | 2 | 146 | 34 | 81.1 |
| > 75 | 5 | 132 | 12 | 91.7 |
| > 105 | 7 | 128 | 9 | 93.4 |
| > 150 | 10 | 117 | 7 | 94.4 |
| > 225 | 15 | 105 | 5 | 95.5 |
| > 300 | 20 | 99 | 3 | 97.1 |
TTG; anti-tissue transglutaminase antibody; UNL; Upper Normal Limit; PPV; Positive Predicitve Value