LA survey response and reported use of dual tests on samples collected by the NCSP for people aged 15–24 years, with estimated numbers of gonorrhoea (NG) tests performed, confirmed diagnoses, and unconfirmed reactive tests for 2012
| PHE region | Number of LAs | Survey response, number of LAs (%) | LAs (%) using dual tests* | Non-GUM CT tests† | If community-based NG prevalence is 0.1% | If community-based NG prevalence is 1.0% | ||
|---|---|---|---|---|---|---|---|---|
| Estimated NG diagnoses‡ | Estimated unconfirmed reactive NG tests (PPV=17%)§ | Estimated NG diagnoses‡ | Estimated unconfirmed reactive NG tests (PPV=67%)§ | |||||
| All | 152 | 98 (64) | 52 (53) | 456 085 | 456 | 2278 | 4561 | 2258 |
| London | 33 | 21 (64) | 14 (67) | 98 250 | 98 | 491 | 983 | 486 |
| Midlands and East of England | 35 | 26 (74) | 6 (23) | 67 362 | 67 | 336 | 674 | 333 |
| North of England | 50 | 34 (68) | 21 (62) | 194 321 | 194 | 971 | 1943 | 962 |
| South of England | 34 | 17 (50) | 11 (65) | 96 152 | 96 | 480 | 962 | 476 |
*Number and percentage of LAs using dual tests out of those responding to the survey.
†Number of non-GUM CT tests performed in all LAs using dual tests as a proxy for the number of gonorrhoea screening tests performed, using data extracted from CTAD which comprises all chlamydia testing carried out in England.
‡Estimated number of confirmed NG diagnoses arising from use of dual tests on samples collected by the NCSP (non-GUM) if NG prevalence is 0.1% or 1%.
§Estimated number of reactive but unconfirmed NG tests arising from use of dual tests on samples collected by the NCSP (non-GUM) if NG prevalence is 0.1% or 1% and the sensitivity and specificity of test are 99.5%.
CT, Chlamydia trachomatis; CTAD, Chlamydia Testing Activity Dataset; GUM, genitourinary medicine; LA, Local Authority; NCSP, National Chlamydia (CT) Screening Programme; NG, Neisseria gonorrhoeae; PPV, positive predictive value.