Introduction: In April 2016 we changed from TV culture to BD Viper NAATs testing and from testing all women to only testing women who were symptomatic, STI contacts, had previous TV and male contacts of TV.
Methods: Laboratory data and SHHAPT codes retrospectively identified all patients diagnosed with TV between 1 May - 30 November 2016. Electronic patient records (EPR) were reviewed and data analysed in Excel.
Results: There were 96 new diagnoses, 93 females and 3 males, median age 31 (IQR 24-40). 66% Black Afro-Caribbean; 3 were sex workers.  91% symptomatic, 22% had STI co-infection, 26% bacterial vaginosis, 7% candida and 32% previous TV.
Wet prep microscopy (WPM) detected 65% of symptomatic cases. Treatments were Metronidazole or Tinidazole.  
The audit standards our service achieved (BASHH performance standards target- 97%) were: 100% received appropriate antibiotics, 51% written information receipt documented, 90% had partner notification recommended (PN) and 28% PN confirmation.  Cost analysis summary:

2015 (Culture)
2016 (NAATs)
Tested
3054
1859
Positive
84
117
New infections
73
96
Cost
£19,851
£15,486
Discussion:
TV NAATs cost more than culture but changing our protocol reduced the overall cost whilst increasing the number of new diagnoses; enabling us to target testing to patients at highest risk.  35% (27) were missed on WPM. 9.3% (9) were asymptomatic and detected because of testing as contacts of TV / sex worker / cervical cytology detection. Recommendations include: staff training to improve completion of PN and modifying our EPR fields to improve documentation of leaflets having been given.

TV or Not TV: Using NAATs to Improve the Cost Effectiveness of Testing. Audit of the Management of Patients with Trichomonas Vaginalis, Using Nucleic Acid Amplification Technique (NAAT) testing in a high TV Prevalence area.

The Joint Annual Conference of the British Association for Sexual Health and HIV & the Society for the Study of Sexually Transmitted Diseases in Ireland