Appendix 1.

Code lists: C. Tests for Neisseria gonorrhoea.

GPRD Medical Code	Read/OXMIS Term	Read/OXMIS Code
249090	Gonorrhoea infect. titre test	43E6.00
309228	Neisseria gonorrhoeae polymerase chain reaction	43h6.00
309635	Neisseria gonorrhoeae nucleic acid detection	43jA.00
340376	Gonococcal swab	4JLA.00
342356	Gonococcal cervical swab	4JKB.00
343558	Gonococcal urethral swab	4JKC.00
348093	Gonorrhoea test positive	4JQA.00
348168	Gonorrhoea test negative	4JQ8.00
348381	Gonorrhoea screening counselling	677M.00