Tubes and inadequate monitoring of anonymous specimens before and after changing the return link
| Year | Quarter | Total testing | Anonymous, n (%) | Total positive, n | Positive lost (% of total n, positive) | Advanced lesions missed (estimated) | Inadequate tests, n | Tests delivered within 6 days, n (%) |
| 2011 | 2 | 13 499 | 314 (2.3) | 725 | 17 (2.3) | – | 140 | – |
| 3 | 23 407 | 244 (1.0) | 1196 | 7 (0.6) | – | 226 | – | |
| 4 | 21 099 | 300 (1.4) | 1101 | 8 (0.7) | – | 206 | – | |
| Total 2011 (from 1 March) | 58 005 | 858 (1.5) | 3022 | 32 (1.1) | 10 | 572 | Not available | |
| 2012 | 1 | 16 807 | 200 (1.2) | 827 | 3 (0.4) | – | 190 | – |
| 2 | 14 932 | 139 (0.9) | 759 | 4 (0.5) | – | 172 | – | |
| 3 | 21 952 | 73 (0.3) | 1068 | 2 (0.2) | – | 458 | – | |
| 4 | 19 061 | 148 (0.8) | 826 | 13 (1.6) | – | 552 | – | |
| Total 2012 | 72 752 | 538 (0.7) | 3480 | 22 (0.6) | 3 | 1372 | Not available | |
| 2013 | 1 | 19 861 | 278 (1.4) | 825 | 18 (2.2) | – | 169 | – |
| 2 | 16 308 | 302 (1.9) | 671 | 17 (2.5) | – | 48 | – | |
| 3 | 25 068 | 262 (1.0) | 1012 | 12 (1.2) | – | 199 | – | |
| 4 | 18 194 | 266 (1.5) | 986 | 11 (1.1) | – | 118 | – | |
| Total 2013 | 79 431 | 1050 (1.3) | 3444 | 58 (1.7) | 8 | 534 | Not available | |
| 2014 | 1 | 16 259 | 116 (0.7) | 769 | 9 (1.2) | – | 14 | – |
| 2 | 17 108 | 134 (0.8) | 881 | 5 (0.6) | – | 46 | – | |
| 3 | 13 575 | 211 (1.6) | 674 | 8 (1.2) | – | 19 | – | |
| 4 | 23 611 | 175 (0.7) | 1120 | 9 (0.8) | – | 720 | – | |
| Total 2014 | 70 553 | 605 (0.9) | 3444 | 31 (0.9) | 3 | 799 | Not available | |
| 2015 | 1 | 19 259 | 115 (0.6) | 890 | 6 (0.7) | – | 795 | 18 526 (96.2) |
| 2 | 19 082 | 99 (0.5) | 919 | 5 (0.5) | – | 990 | 18 134 (95.0) | |
| 3 | 17 377 | 80 (0.5) | 770 | 0 (0.0) | – | 975 | 16 607 (95.6) | |
| 4 | 23 671 | 125 (0.5) | 1110 | 4 (0.4) | – | 1379 | 23 273 (98.3) | |
| Total 2015 | 79 389 | 404 (0.5) | 3689 | 15 (0.4) | 2 | 4139 | 76 540 (96.4) | |
| 2016 | 1 | 20 721 | 104 (0.5) | 986 | 7 (0.7) | – | 825 | 20 157 (97.3) |
| 2 | 17 691 | 68 (0.4) | 793 | 5 (0.6) | – | 593 | 17 160 (97.0) | |
| 3 | 14 996 | 34 (0.2) | 660 | 2 (0.3) | – | 643 | 14 611 (97.4) | |
| 4 | 19 538 | 56 (0.3) | 906 | 1 (0.1) | – | 858 | 18 869 (96.6) | |
| Total 2016 | 72 946 | 262 (0.4) | 3345 | 15 (0.5) | 2 | 2919 | 70 797 (97.1) |