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False positive rates of functional C1 inhibitor by referring centre
| Analysed | Low C1inhF | True low (C1inhD) | False positive (%) | |
| Centre 1 | 272 | 63 | 6 | 90 |
| Centre 2 | 296 | 74 | 27 | 64 |
| Centre 3 | 570 | 172 | 79 | 54 |
C1inhD, C1 inhibitor deficiency; C1inhF, C1 inhibitor function.
