| Numbers rejected (%) | ||||
| Specific issue | 2011 | 2012 | 2013 | Overall |
| Clotted specimen | 5 (45) | 4 (36.4) | 2 (18.2) | 11 (50) |
| Insufficient specimen | 3 (60) | 1 (20) | 1 (20) | 5 (22.7) |
| Wrong labelling | 3 (100) | 0 (0 ) | 0 (0 ) | 3 (13.6) |
| Wrong tube | 2 (66.7) | 1 (33.3) | 0 (0 ) | 3 (13.6) |
| Total | 13 (59) | 6 (27.2) | 3 (13.6) | 22 (100) |